Brand Name: kawata Model Number: KT-91 Type: Active,Emergency / Portable Use: Mobile Phone,Mobile Phone, Outdoor Channels: 1 Special Feature: Wireless,Wireless, Portable Place of Origin: Guangdong China (Mainland) Color for choice: white, black, grey,and so on Feature: Arabic and English talking, two handsfree Fitting 1: Bluetooth connecting , wireless Fitting 2: Re-charging iPhone Fitting:: user manual, color gift box Product Name: High Quality Base Dock Charger for iPhone Packaging & Delivery Packaging Detail: Normal giftbox and bubble bag Qty/CTN:20PCS. CTN size: 45.9 x 37.0 x 46.6cm CTN GW: 16.6kg Qty/1x20'GP: 6660PCS Qty/1X40'GP: 13840PCS Qty/1X40'HQ: 17420PCS Measurement of carton: 0.078CBM Delivery Detail: 25-30 days after received order details and deposit Specifications -Solar bluetooth speaker -CE,REACH,ROHS, -Radiation -Charging accessory -Bluetooth handset Solar bluetooth speaker &nb
Specifications NFC Bluetooth Speaker NFC Speakers Built-in Battery Microphone Bluetooth NFC Bluetooth Speaker with Built in Microphone, 2x 3 WattIntroducing: Introducing Chinavasion’s first NFC equipped portable speaker. Using Near Field Communication, connecting a NFC enabled phone to the speaker couldn’t be easier. With a simple tap against the speaker, both devices will automatically pair and blast out your favorite tunes. And don’t worry if you don’t have any devices packing NFC, you’ll still be able to connect to the speaker using Bluetooth!How To Get Prices For This Product:- Note down the Chinavasion product code [CVXD-A242]- Click the Alibaba "Contact Now"- Email us with the product codes you're interested in.- We'll reply to you with prices in one working day!------------------------------------------------------------------------------------------------ Manufacturer SpecificationsGeneral * Bluetooth: BLuetooth 3.0 +
Specifications 1, wireless bluetooth speaker 2, Excellent sound 3,best quality,lowest price 4,stock,fast delivery 5,handfree function 2013 hot seller bluetooth speaker/wireless bluetooth speaker/mini speaker features of bluetooth speaker 1, Bluetooth Speaker 2, HIFI Bluetooth Design Can Read MP3 and USB Flash Drive funtion 3,Aux Function ,5P Charging jacke 4, Outlay Li battery 5,FM Radio , hands free call Voltage :5V Material:ABS distortion rate :1% SNR:85dB Power rated :8W Frequency response :100-18khz Jacket :3.5 mm audio jacket Product Size : 62*62*65MM Within a magnetic Speaker Size : Dia.40 *H22.5MM Speaker Features : DUAL voice coil , 10-core dual magnetic Color Box Size :92*92*90MM Net Weight : 166g Line in Input/Support Bluetooth Play / Support TF Card Player /Support MP3 WMA Format/Mini USB 5V Support charging /Bulit in 4.2V lithium polymer battery
Brand Name: SZHZK Model Number: HZK-M013 Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Computer Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Output power: 3W Color: Red/silver white Loud speaking: 50MM, 4Ω Product size: 68*58*58mm Mass storage: 650mA Response rate: 80db±2db SNR: â¥80Db Output: 3.7V Input: 5.0V Material: Aluminium Packaging & Delivery Packaging Detail: 100pcs/ctn Delivery Detail: 3-10workdays Specifications bluetooth speaker 1.Output power: 3W 2.Color:red,blue,silver,black 3.Output:3.7v 4.product size:68*58*58mm New style vibration audio audio wireless bluetooth speaker specifications Output power3WColorRed,Silver white etc.Built-in loud speaking50mm 4Ω 3WFrequency response120Hz-20KHzMass storage450mAResponse rate80db±2dbSNR≥80Db New style vibration audio audio wireless bluetooth speaker characterastics &nb
Specifications mini bluetooth speaker with beautiful outlook, Bluetooth 4.0+EDR l Bluetooth Specification:Bluetooth 4.0+EDRl Frequency Response:2402-2481MHzl Mediation:Press-buttonl Support Codec: SBCl Support: A2DP AVRCP l Special Feature:Wireless, Portable, Mini, LINE IN, TF CARDl Power:DC 5V,Lithium battery (500mah)l Loudspeaker Output: 3Wl Speaker Unit: 40mml Signal-to-Noise: >85DBl Distortion: <0.5% @(1KHz)l &nb
Specifications V2.1 Bluetooth Speaker. Colors Black.Silver.Blue.Pink Specification Operation range: Up to 10 metersBluetooth version: V2.1+EDR3W loud speakerBulti microphone to make a callMulti point,support to connect 2 cell phone at same timePower on/off switchSolution: CSR BC5Talk time: Up to 5 hoursMusic play time: Up to 5hoursStandby time: Up to 800 hoursWeight: about 73 gramsDimensions:Φ50*65mm(max)Battery type: Rechargeable Poly -Li batterySupported profile: Headset, Hands-freeSupports Bluetooth Advanced Audio Distribution Profile (A2DP), AVRCPTransfer a call between the mobile phone and the headset Multifunction: make a call, end a call, and reject a call, call redial,Music operation: Play, PauseUniversal Mini USB charge port
Brand Name: R8 Model Number: BT30S Type: Active Use: Portable Audio Player,Mobile Phone,Computer,Bluetooth device Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Lithium battery: 850mah Unit Dimension: 245*45mm speaker dimension: 40mm*2 Material Plastic: ABS Bluetooth version: V2.0 Amplifier power output: 2w*2 Frequency Response: 100Hz-20KHz Input Impendence: >10K Ohms Power input: 5V(USB) or battery Packing: color box Packaging & Delivery Packaging Detail: 1.Color box 2.20pcs/CTN Delivery Detail: 15 days Specifications Bluetooth Speaker for iPad and Other Tablet PC 1.With 2 Loudspeaker 2.MOQ=20pcs 3.850Amh Battery 4.Red,Green,Silver,Blue Bluetooth Speaker for iPad and Other Tablet PC Bluetooth Speaker Features:Comply with Bluetooth 2.1+EDRMusic playback time is up to 8 hours with 800mAh battery.Support A2DP and AVRCP profileRF range is up to 10MUltra-simple style designHidden key designAluminum enclosure design, top
Specifications Bluetooth Speaker with Mic new arrival(BQ-608) 1. Bluetooth specification: V2.1 +EDR 2. Operation Range: Up to 10 Meters Bluetooth Speaker with Mic new arrival(BQ-608) Bluetooth, TF card music playback, FM radio 3 in 1 Features:1. Bluetooth specification: V2.1 +EDR 2. Operation Range: Up to 10 Meters3. Music formats:MP3,WMA,AMR,FLAC,APE,Vorbis etc4. Built-in rechargeable(lithium-Polymer) battery5. Recharge time: 3 hours full charge6. Playing time: 8 hours/ Talk time: 5 hours7. Built-in Microphone8. Support Micro SD card input slot up to 32GB9. FM radio function:FM support automatic station search , and maintain an effective radio with the release to listen10. U disk function:Connected directly to a PC via a USB cable, when speakers T card as a U disk directly copy songs11. HD lossless decoding:Special support APE,FLAC the HD lossless file decoding, restore sound is essentially12. Signal to noise ratio:≥90DB13. Output Power:45mW/Frequency output: 20Hz-200kH
Brand Name: DOSS Model Number: DS-1116 Type: Active Use: Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Outdoor Channels: 1 Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Bluetooth: bluetooth v2.1+edr A2DP Handsfree Frequency: 150Hz~20KHz Battery: built in 500mah Interface: TF MiniUSB 3.5mm jack Size: 78mm diameter x 68mm H Material: Silicone rubber Dustproof steel screen Packaging & Delivery Packaging Detail: Original Package Delivery Detail: Within 24 hours after payment confirmed Specifications Doss ds-1116 Bluetooth Speaker 1.Bluetooth V2.1+EDR A2DP 2.speaker: 2 inch 3w 3.battery: built in 500mAh Doss DS-1116 Hurricane Wireless Bluetooth speaker For smart tablet pc mini Bluetooth speaker Doss ds-1116 Bluetooth Speaker1.Bluetooth V2.1+EDR A2DP2.speaker: 2 inch 3w3.battery: built in 500mah Specfication model : Hurricane DS-1116 update version size : 78mm diameter x H 68mm Bluetooth ve
Brand Name: OEM Model Number: S02 Bluetooth speakers Type: Passive Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) material:: Wooden bluetooth speaker Suit for: iphone,ipad mobile phone, computer, tablet PC Size:: Dismater 5cm Heght 6.5cm Power:: 1.5W portable laptop mobile bluetooth speaker Speaker unit:: 1 inch Bluetooth speaker FrequencyResponse:: 80Hz-20kHz Signal to noise ratio:: 80dB Distortion factor:: 0.5% Impedance:: 4 ohm OEM: available Packaging & Delivery Packaging Detail: cartons Delivery Detail: 15-25 days Specifications 1.Portable Bluetooth Speaker 2.material: High-grade wood 3.Speaker:1 inch 4.Portable bluetooth speaker 5.mobile:Hand-free For laptop iphone Mini Portable Bluetooth Speakers Bluetooth speaker Feature: 1.Model: S02 2. Bluetooth speaker Suit for:iphone,ipad mobile phone,
Specifications bluetooth speakers 1.Compatible with multimedia device 2.Compatible Micro SD/TF 3.Material:Aluminum alloy Hot selling bluetooth speakers with Aluminum alloy Specifition Built-in Lithium-ion batteryPower SupplyLithium-ion,Computer-USB-in,DC-inCompatiblemobile/computer/MP3/MP4SupportMicro SD/TFOutput3.5mm AUX in5PIN Output3WMemory PlayAuto remember the last song & play mode playedFrequency response150-18KHz,SNR:≥80dbMaterialAluminum alloy Package product size60mm*H55mmgift box size113*70*68mmNW230gGW330gcarton size33.5*13*16cmpcs/ctn10pcs,4KG
Model Number: GF-AY-98 Use: Mobile Phone Place of Origin: Guangdong China (Mainland) Packaging & Delivery Packaging Detail: Blister packing Delivery Detail: 1-2days Specifications 1.Bluetooth Speaker AY-98 2.Bluetooth Speaker with FM and Card Reader function. 3.Can read SD/MMC Card, U disk 1.Bluetooth Speaker AY-982.Bluetooth Speaker with FM and Card Reader function.3.Can read SD/MMC Card, U disk; MP3/4 Player and mobile phone music4.4w, 80-18k (Hz)5.Mini Bluetooth speaker
Brand Name: EST Model Number: EGR Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) bluetooth speaker: wireless bluetooth speaker Packaging & Delivery Packaging Detail: as your request Delivery Detail: within 20 days after sample approved Specifications * Mini design; * With handsfree function ; * Bluetooth Speaker with suction cup; * For phone; Features: 1.Bluetooth speaker with high capacity 400mAH rechargeable polymer lithium battery last up to 6 hours playback time;2. Housing bluetooth speaker with rubberized/silicone shell for waterproff and sunction cup for sucking on any smooth surface;3.Built-in microphone for hands-free phone calls;4.Mini Bluetooth Speaker with compact vacuum bass design;5.High-end stereo Bluetooth speaker;6.Can be used for outdoor camping, hiking, climbing mountains and other outdoor exercises;7.Portable bluetooth
Specifications bluetooth speaker *Bluetooth 3.0 wireless *Built in battery *Handsfree call *Easy to use in car,office etc 2013 newest best design wireless mini bluetooth speaker for mobile with hand-free function This Bluetooth speaker stand for all Bluetooth compatible iProducts, smartphones, tablets, PCs and other devices that can stream Bluetooth audio is designed to deliver a superior audio experience as a mini portable speaker system.
Brand Name: tetc Model Number: BSGP013 Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage,Outdoor Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Color:: as picture shown Design:: wireless Service:: OEM/ODM Advantage:: Factory price with high quality Packaging & Delivery Packaging Detail: 1.Polybag, Blister Package, Crystal Box Package, Gift Box Package 2.as client's requirement Delivery Detail: 3-5 workdays depend on your quantity Specifications Bluetooth Speaker with cellphone handfree function and Support TF card 1.Hot sale Item 2.High quality 3.Fast delivery Bluetooth Speaker with cellphone handfree function and Support TF card Product Description: Features: 1,aluminum alloy case, simple, durable, easy to use 2,Blue 2.1 + EDR standard, 3, up to 6 hours of music playback time, support for Bluetooth stereo, support TF card play function 4, excellentsound quality, bass shoc
Specifications 1.Wireless speaker 2.Portable design for carry around 3.Support Apple i-Pod, i-Pad, i-Phone etc 4.Factory(OEM/ODM) Features:.Bluetooth Music Speaker for mobile phone & PC .Bluetooth Stereo (A2DP Profile) compliant, HFP, HSP, AVRCP .Bluetooth V2.0+EDR compliant, Bluetooth V2.1 ready .Mobile phone freehand for auto switching from music to phone and come back to music .Class D Audio amplifier supports 2 x 2W True RMS stereo speaker output .Supports Line in connecting music devices freely .upports Line out connecting external speaker .Personal, and home design for portable usage .Standard AAA battery design .Bluetooth designed with auto power saving in 5 minutes without connection .Support Apple i-Pod, i-Pad, i-Phone and Other Bluetooth function Notebook/PC/Mobile phone Specifications(Form Factor): .Personal and Home usage stylish .Portable design for carry around .Speaker mixed up personal device style in new era mobile phone companion Speaker:.Stereo speaker .2W
Specifications 1. Sound Cup my vision bluetooth speaker 2. unique design like a coffee cup, best sound Sound Cup my vision bluetooth speaker Our private design and mold 2" speaker with two channels, stereo function is obvious. The Cup surface is high gloss, not painting, it will not easy to be scratched and will not lose color. Specifications: 1. output power: PO=3W2. speaker size: 2”3. battery voltage: 3.7V4. battery capacity: 900Mah5. Bluetooth protocol:ISSC 3.06. Signal&noise ratio:S/N≥75DB7. colour:white(option)8. Wireless Range:8-10m
Specifications 1.Most popular Bluetooth speaker 2.TF slot 3.USB port 4..Rechargeable lithium lon battery 5.Support hand free calls, and e Mini stereo Bluetooth speakers Function & Feature: 1. Play MP3 format music from MP3/MP4/IPOD/Computer/USB/TF card and other device etc.2. With FM radio;3. Support USB/TF card up to 16GB;4. Support Bluetooth function;5. Rechargeable battery:BL-5C;6. Support line-in function;7. Support hand free calls, and echo. Technical parameters: Model Number:NS1115Compatibel with:iPhone,iPad, table pc, notebook etc( include all device with Bluetooth function)Dimension:60mm*H50mmLoud speaker45MM; 3ΩPower output:3WBluetooth: Bluetooth V2.0+EDRBluetooth profile:<10M( According to environment and mobile phone Bluetooth device, transmission range have some different)USB charge voltage: DC 5VBattery: Built in li-ion battery, 3.7V 400 mAhPlaytime:4-8 hoursColor:OEM
Specifications 1.Mini Bluetooth Speaker 2.With rechargeable Lithium battery 3.8 colors 4.HD microphone and speaker 5.TF card port Features & Specifications: This is a new lovely mini bluetooth speaker for bluetooth enabled devices.1.Audio input:Via bluetooth connection or 3.5DC plug cable.2.With microphone for your calling conversation.3.With TF card port by which you can play musics.4.Bluetooth version: Adopt CSRV2.1 bluetooth chip,backward compatible to V2.0,V1.2,V1.1. Support A2DP,AVRCP,Handsfree protocal. Specifications: Bluetooth versionV2.1Distance10 metresDemenssion60*60*60MMN.W.230gDrive unit45MM(Dia)Rated power3WFrequency response280Hz-16KHzSNR>95dBDistortion<0.5%Battery capacity520mAhCharging voltage5V±0.5VCharging duration2 hoursColorblack,white,red,pink,green,blue,purple,orangeSatandard accesoriesCharging cable,Instruction manual,bluetooth speaker
Specifications 2013 Newest Bluetooth Mini Speaker (ST-BS01) Material:Metal Color:pink,red,black Range:10m CE,FCC,ROHS 2013 Newest Bluetooth Mini Speaker (ST-BS02) Version Bluetooth V2.1+EDR Battery 3.7 V 600 mAh,rechargeableCharge Time 2-3 hoursRange 10M Standby time About 6 hours (battery saturation state) &nb
Specifications bluetooth speaker: > Metal Sense Design > Bluetooth wireless audio transmission > With phone handsfree > CE ROSH bluetooth speaker Specifications: » Max power output: 3W » Frequency: 2.402-2.480GHz » Sensitivity : -32db » Distance : 10meters » Working Voltage: 4.8V to 5.5V DC » Battery Capcity: 600MAH » Amtenna: Build in antenna Packing Details: 1> Product Size: W74mm*H59mm 2> Gift box Size: 124*88*65 mm 3> Master Carton Size: 45.5*35*27 CM 4> 50pcs/CTN 5> Weight: N.W: 18.0KG G.W: 19.0KG Container Loading Qtys: A. 1*20GP: 31,250 piec
Specifications 2.0, Bluetooth, SD, Pen Drive, 3.5mm Aux in, External iPhone Docks, Remote controller Give a laptop wireless audio streaming capabilities Specification:Power output: RMS 6W*2Driver: 3'*2Frequency response: 60Hz - 20kHzSNR: >65 dbTHD: <5% @ 1 kHzBluetooth distance: 10m, max*Dimensions: D100*W280*H110mm Features:2.0 flash reader speakerBluetooth A2DPDecoding MP3 & WMA in SD card & pen drive3.5 mm stereo aux in availableVolume controlRemote controlLED power indicator Cables Stereo audio cable: Black, 0.7 m with 3.5 mm audio jack on both endsPower cable: Black, 1.8 m High gloss finishes by using ABS+PMMA plastic materials It is easy to connect this stereo USB powered speaker to a Laptop or PC. Comparatively small and clever, this speaker comes complete with a stylish classic black finish with two Φ40 mm micro drivers to deliver stunning sound. The speakers make use of the high efficiency of class D
Brand Name: Ansonwell Model Number: ASW-SBL001 Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Computer,Stage,Outdoor,Travel Channels: no Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Material: ABS Plastic Color: white,gray,black Product Size: 140*65*30 Weight: 0.171kg Packaging & Delivery Packaging Detail: Color box & OEM packing Delivery Detail: 2-5 days Specifications bluetooth speaker 1.for mobile phone,MP3,computer.. 2.Support TF card 3.Bluetooth Remote Control 4. LED screen bluetooth speakers Features:1.Touch-sensitive buttonsPlay stereo music from any A2DP sourceAux line in for portable music players,2.dual track3.Built-in stereo Bluetooth transfer technology4.Detachable and rechargeable battery,up to 8 hour music playing time5.Functions: - Switch on / off, Pairing Transfer stereo music from any A2DP source or other portable music players,volume adjustment6.power:2.5W*2Material: ABS Plastic
Specifications Price: $10.50/pc to $15/pc Colors: blue,red,black round bluetooth speaker to laptop computers with 3.5 mm audio cable and Micro usb cable Painted by rubbe oil, High-grade fineness and fine touching feel,made with environmental protection material, small and portable, delicate and cool.owned wireless phone function, especially suitable for people who are driving, safe and no radiation pollution Equipped with an answer button, which owned decline a call and phone callback function Equipped with 3.5 mm audio cable and Micro usb cable, owned audio play and charge function Supports breakpoint memory mode, can automatically memory the songs you quit play last time and patterns The microcomputer power in the Speaker usb can automaticly and quickly charge lithium battery stereo audio input, can be connected to laptop computers and all kinds of audio-visual products can be used 4-8 hours continuously when completed chargedMax output power: 3 wlithium battery voltage:
Brand Name: Transway Model Number: TW005 Type: Active Use: Portable Audio Player,Mobile Phone,Computer,tablet pc Channels: 1 Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Battery: Built-in 450mAH Li-ion battery Built-in Microphone: Yes Speaker Weight: 90g Color: red, orange, pink, yellow, green, blue, purple, black, white Packaging & Delivery Packaging Detail: Color Box Dim (mm): 85*62*62 Delivery Detail: 1-3 days Specifications Bluetooth 2.0/Bluetooth 4.0 Speaker Sucker Built Under the Speaker to Attach to Flat Surfaces Built-in Microphone Fashionable 9 colors waterproof cheap bluetooth speaker Bluetooth Portable Stick On Speaker with Bluetooth connectivity and a Built-In Battery is a great accessory for any smartphone or tablet user, and a great way to get high in any situation. This speaker is easily attached to any smooth surface using the sucker under the speaker and can be attached to places such as glass, your Tablet PC, o
Specifications 1.Suport TF card 2.High quality good sound 3.With handsfree function 4.Portable mini style High quality good sound portable bluetooth speaker Power Specification :Power : 1*5WResponse Frequency : 100HZ-18KHZSNR : 80dBDistortion : Less 1%Product Size : 62*62*65MMWithin a magnetic Speaker Size : Dia.40 *H22.5MMSpeaker Features : DUAL voice coil , 10-core dual magneticColor Box Size :92*92*90MMNet Weight : 166gBluetooh :about 10M
Brand Name: HY Model Number: BT-52A Type: Active Use: Portable Audio Player,Mobile Phone,Computer Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Output power: 1.5w + 1.5w = 3w Size: 207 * 24* 32mm Weight: 130g Charge: by mini USB port Charge time: 3.5H Working time: 5H Speciel function: Passive woofer technology Colour: Silver;white;black;red OEM: Acceptable Package: Gift color box Packaging & Delivery Packaging Detail: High quality plastic bags, foam boxes, cartons and wooden pallets are used to ensure that every package is firm and secure. Delivery Detail: 3-5 days Specifications super Hot Wireless bluetooth speaker for iphone With NFC Hands-free function Powerful battery super Hot Wireless bluetooth speaker for iphone 1.Specification Output power1.5w + 1.5w = 3wWeight130gSize207 * 24* 32mmChargeby mini USB portCharge time3.5HWorking time5H Compatible with the below devices: 2.Product fea
Brand Name: Mstar Model Number: MT-6809 Type: Passive Use: Mobile Phone,Computer Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: China (Mainland) Packaging & Delivery Packaging Detail: gift box,standard export packing Delivery Detail: 20-25 days after payment confirmed Specifications Bluetooth Speaker with LED disco color light Bluetooth Speaker with LED disco color light Picture: SPECIFICATION: 1.Bluetooth Speaker 2.LED warm and white light
Specifications NEWLY DESIGN multifunction bluetooth speaker KD-025 5 V - USB straight charging source interface Support Micro TF card NEWLY DESIGN multifunction bluetooth speaker KD-025 Function Description>>Double horn output speakers;>>Power bank;
Specifications 1.Portable Bluetooth Speaker 2.material: High-grade wood 3.Speaker:1 inch 4.Portable bluetooth speaker 5.mobile:Hand-fre COOL 2013 new portable bluetooth speaker Bluetooth speaker Feature: 1.Model: S02 2. Bluetooth speaker Suit for:iphone,ipad mobile phone, computer, tablet PC 3.Hand-free function:Support4.Size: diameter 4.5 cm, Height 5.1 cm 5.Adjustment: button Specification: Name Portable Bluetooth Speaker Model S02Material WoodenSpeaker unit 1 inchLoudspeaker