Specifications bluetooth speaker with microphone with SIRI function private mode bluetooth speaker CE, ROHS, FCC, BQB one year warranty Specificationsbluetooth speaker with microphone with SIRI function private mode bluetooth speaker CE, ROHS, FCC, BQB one year warranty 2013 latest stereo bluetooth speaker with microphone
Specifications 1.Mini Bluetooth speaker hanging portable design 2. Bluetooth wireless audio transmission 3. ariety of classic color forchoice Perfect sound mini Bluetooth speaker for Mobile phone. Specifications: Specification:Bluetooth VersionV:2.1Frequency100Hz-20KHzDistortion≤0.5%Signal-To-Noise≥85±2dbLoudspeaker Output3WRF Range<10metersBatteryBuilt in lithium batteryCapacity300MahCharging VoltageDC 5VWorking Voltage3.3~4.5VHands-free functionNoLine inYesCharging Time~3hPlayback Time~4hMaterialABSColorOptionalAccessoriesCharging cable,User ManualDimension43* H50mmWeight0.08kg G.W.:10kgGiftbox Size4.5*4.5*8cmCarton Size36.5*34.5*24.5cmQuantity per Cartoon50pcs/ctn20GP42100pcs,842ctns40GP87500pcs,1750ctns40HP110200pcs,2204ctns Product photos latest product
Specifications Wireless Mini Bluetooth Speaker *Compatible with all Bluetooth-enabled mobile phones, iphone, ipad, Tablets, PC/Mac *CE&ROHS Item name: 2013 New Product Portable mini Bluetooth SpeakerItem NO.: HZ-921 Speaker Specification:
Brand Name: OEM Model Number: GP-506 Type: Passive Use: Home Theatre,Portable Audio Player,Mobile Phone,Computer,Stage Channels: 1 Special Feature: Portable,Mini Place of Origin: Guangdong China (Mainland) color: optional certificate: CE/RoHS/FCC MOQ: 1000 pcs Loudspeaker size:: 40mm 40 OHM Output:: 5w Battery Capacity:: 900mAh Unit size:: 70DX30(in)H or 42(out) H Package:: 1pc/Acrylic box Charging time:: 1 hour Aux jack: 3.5" audio head Packaging & Delivery Packaging Detail: Acrylic box,or colored box Delivery Detail: 15days Specifications 1 bluetooth speaker 2)amazing sound effect 3)OEM color and logo 4)NFC speaker 5. fashion pop up design 2013 new and hot wireless portable strong bass NFC bluetooth speaker Breif introduction: 1.strong bass perfermance .2.Compatible with all line in audio source,MP3,Note Book PC,Gaming Devices,iPod, Mobile Phones,CD player3.Built in rechargeable Li battery4.outlook in special style,it is larruping &n
Brand Name: 1ST Model Number: FS-BT788S Type: Active Use: Mobile Phone Channels: 3 (2.1) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Product name: Mini bluetooth speaker Color: 4 colors available Charing Voltage: 3.7V-4.2V DC Working Voltage: 4.8V-5.5V DC Output power: 3W Working Current: 200MA Bluetooth Version: 3.0 Frenquency: 2.402-2.480GHz Range: 10m Data Transmission: Up to 3Mbps Packaging & Delivery Packaging Detail: Each one in color box, or as per your request Delivery Detail: depending on order quantity Specifications 1. Wirless Bluetooth Input 2. Audio Transmission 3. Handsfree function Mini portable bluetooth speakers for mobile phones Mini Bluetooth speaker, stereo bluetooth speaker, portable bluetooth speaker, wireless speaker for mobile phones, tablet PC Features: 1. High-end stereo Bluetooth speaker2. Supports any mobile device comes with Bluetooth function such as IPHONE, IPAD, Samsung Galaxy/Note/tablet, Laptop, Tablet
Brand Name: OEM Model Number: YD106 Use: car shape Special Feature: Portable Place of Origin: Guangdong China (Mainland) Material: ABS logo: silk color: red, white package: gift box/customized Battery: DC5V-1000MA Power Supply: Built-in Battery, Mini USB Range: 10 meters Bluetooth Version: Bluetooth V2.1+EDR Size: 250*105*55mm Packaging & Delivery Packaging Detail: gift box/customzied Delivery Detail: 20 working days after sample confirmed(depends on stock) Specifications Bluetooth VersionaaBluetooth V2.1+EDR Frequency Responseaa20HZ-20KHZ Rangeaa10 meters SNR aa80dB Power Supply: Built-in Bat Car shape bluetooth speaker CSRResolution:RDASize :250*105*55mmColor: White BlackMaterial:ABSBluetooth Version:Bluetooth V2.1+EDRFrequency Response:20HZ-20KHZRange:10 meters SNR more than 80dBPower Supply: Built-in Battery, Mini USBBattery :DC5V-1000MAsupports bluetooth calling and hands freesupports play memories for the last musicsupports TF cardssupports FM 87.5-108MHZ  
Specifications 1. bluetooth speaker with FM radio 2. For iphone, ipad and MP3 Bluetooth speaker with built-in lithium battery and FM radio. Wireless range: 33feet1.Output power:3W*1 4 ohms2.supply voltage:DC 5V. Li-On battery 3.7V 500MA3.Frequency response:100HZ-20KHZ4.Materail:ABS5.with 3.5 audio jackproduct size:80*80*65mmcolor:any color is availableFunction:with bluetooth/headfree/FM radio /MIC/VOL controlCan work with ipad/iphone/mobile phone/ipod/mp3 etc
Specifications fashionable smart mini wireless bluetooth speaker with suction cup and answering function fashionable smart mini wireless bluetooth speaker with suction funciton Features:1. With creative design, fashionable and attractive2. Built in bluetooth, let you enjoy much freedom.3. With stereo effects, enjoy high quality sound effect.4. Working distance: 10m5. Bluetooth version:2.1+EDR6. With answering function and voicing phone number8. High quality !!!!!9. Packing: product box: 120×70×70 mm Specification:Power supply:DC5.7VOutput power: 3WFrequency: 160-20 HzSignal& noise ratio: 50DbImpedance: satallite ohms+subwoofer 2ohmsSpeaker unit:
Specifications HOT Bluetooth Speaker Wireless bluetooth transmission Built-in ABR,amazing bass effect SD/MMC, USB supported HOT Wireless Bluetooth Speaker WELCOME TO HAIMAN SPEAKER CO.,LTD PROFESSIONAL SPEAKER MANUFACTURER &nbs
Brand Name: TEOTI,Meidio Model Number: KINGKONG-C Type: Active Use: Portable Audio Player,Mobile Phone,Computer Channels: 3 (2.1) Special Feature: Portable,Mini Place of Origin: Guangdong China (Mainland) Color: BLACK Packaging & Delivery Packaging Detail: Packing information 1PCS/White BOX 20SETS/Carton N.W.:22KG G.W.:15.5KG The size of the gift box:8*10cm Delivery Detail: 5-7days Specifications bluetooth speakers , portable bluetooth speakers, sound station, multi-function speakers portable multi-function speakers bluetooth speakers , portable bluetooth speakers, sound station Item No.:KingKong-C With Bluetooth function. Read USB drive, SD card, FM, AM, remote control, LCD display with alarm clock and time memory function Bulit-in subwoofer 2.1 system 3.5 stereo audio input interfaceOutput: 5W×2(RMS) + 10W (Sub-Woofer) SNR:>89dB Impedance: 4 ohms Sound respond frequency:40Hz ~ 20KHz,
Specifications 5.1 bluetooth speakers Portable Rechargeable can connect with any bluetooth device for music Support phone/Laptop SpecificationsHigh quality Wireless Bluetooth Stero Speaker For iphone/Mobile/MP4 1.high quality 2.factory price Detail information: MOQ 2000 PCSdaily capacity 2000-2500 pcs/dayPackagegift box ,skin packing delivery time 15-25 days after depositpayment L/C,T/T , West UnioncertificatesCE, FCC , ROHS etcmain marketAsia , North America, Central/South America, West Europe, Mid East/Africa service OEM / ODM serviceshellABS plastic or aluminumWarranty1.5 year Description: Support phone/Laptop .Tablet PC , TF card (Mini 
Specifications All-in-one Multifunction bluetooth speaker With power bank and WiFi router function High-end quality and factory price All-in-one Multifunction bluetooth speaker with power bank+WiFi router function Function Description >>Double horn output speakers;>>Power bank;>>A P (Access Point) function (WIFI);>>Bluetooth connection function;>>Earphone interface;>>5 V - USB straight charging source interface;>>Support Micro TF card;>>U-disk function. Button and Interface>>Volume+ and Volume-;>>fluctuation songs switch button?>>WIFI button;>>Bluetooth button;>>Power button;>>RJ45 interface;>>TF interface;>>Audio interface;>>USB interface;>>Mini USB interface. Indicator lightSix LED Indicator lamps as below:>>Power light, Bluetooth light;>>WIFI light, Earphone light, Power Bank light.Multifunction Bluetooth speaker T
Specifications XBT patented driver 10W, Hi-Fi level Internal microphone Bluetooth 3.0, stereo 8~20 hrs runtime , real portable XWAVE Bluetooth Speaker Echo 10/Echo 6 Hi-Fi Portable Bluetooth Speaker Official Website:WWW.XWAVE-WHITEHOTT.COM.TW Design in Taiwan Specifications : - Output: 10 Watt (5W*2) for Echo 10 ; 6 Watt(3W*2) for Echo 6 - Size: 175*92*35 mm without strap and carabiner - Weight: 240g without strap and carabiner - Frequency Response: 60Hz-20KHz - Distortion Rate: Max 1% with USB power, Max 5% with battery power. - Bluetooth: 3.0 A2DP + EDR (Stereo version), + AVRCP(remote control) - Battery: 1700mAh for Echo 10 (8~15Hrs) ; 1100mAh for Echo 6 (5~10Hrs) - Accessory: * Usermanual * Strap and Carabiner * USB power cable * 3.5mm AUX cable * Wall plug for Echo 10 only * Color available: Red, Blue, Violet (color available for bot
Brand Name: HFD Model Number: HFD-S60 Place of Origin: China (Mainland) Style: Headset Microphone Use: Computer Microphone Communication: Wireless Packaging & Delivery Packaging Detail: Product Size:6.7*6.7*12cm 100pcs/ctns Ctn Size:57*28*56.5CM G.W:23.5KGS Delivery Detail: 2-3 days for sampes, 15-20 days for mass production Specifications Portable Sucker Silicone Bluetooth Speaker for Iphone,Ipod,Mp3 player Portable Sucker Silicone Bluetooth Speaker for Iphone,Ipod,Mp3 player Bluetooth wireless audio transmission,portable, hanging portable design,Can suck base speakers,Hands-free car bracket of bluetooth speakers &
Brand Name: E-pro Model Number: EBT-310T Type: Active Use: Portable Audio Player,Mobile Phone Channels: 3 (2.1) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Name: Bluetooth speaker Support: TF card FM: FM function For Phone: Hands free function Packaging & Delivery Packaging Detail: Blister package/ Gift box Delivery Detail: 15days after confirmed the order Specifications 1Special design with bluetooth function 2Slim and portable 3Clear sound New product aluminium alloy portable wireless mini bluetooth speaker Product Description: 1.Wireless speaker 2.Support Bluetooth 3.Support A2DP,transferring Hi-FI music by wireless Product Features: *Compatible with Bluetooth phones, MP3/MP4/CD/PC/MAC/PSP/iPHONE/IPAD, etc.*Built-in lithium battery 520mAh*Support TF card (Micro USB card)*Support A2DP, AVRCP, headset, handsfree profile Product Specifications: Bluetooth protocolVersion 2.
Specifications portable mini bluetooth speaker for iPhone/iPad/iPod high-quality , stylish, unique design factory price fast delivery Product DescriptionDescription:Brand: HYUNDAI i80Bluetooth 2.1 + EDRTF card play functionPortable and ergonomic designMini high-quality small speakers, stylish, compact, unique design, individuality tastesBluetooth Speakers for iPhone/iPad/iPod/CellphoneVolume choiceness, does not occupy a space, the exterior is delicate, easy to match Advantage for TF Card Mini Speaker: 1. Bluetooth Wireless Speaker , unlimited music FunPlay music wirelessly via bluetooth technology for smart phones and tablet PCS, put aside the traditional connection shackles , stable and reliable transmission of audio , high -quality audio play back and bring you wonderful music experience with super bass effect . 2. Spport mobile phone calles and redial function Built- in micorphone and supoort one -touch answering of phone calls , either single or multiplayer phone call c
Specifications BLUETOOTH SPEAKER Model MAV-8525Description2CH High-end Speaker with Bluetooth Aluminum Panel and High-Glossy cabinetsTouch Panel for Function Control
Specifications 1.Mini bluetooth speaker with mic 2.Support to headset ,handfree 3.Support micro SD card Feather: 1.Mini bluetooth speaker with mic2.Support to headset ,handfree3.Support micro SD card 4.Can stick on all of the surface :table, glass,door,notebook ,computer case....5.When stick on the mobile back ,can be act as stand6. You can enjoy the music when sporting ,travelling,showering 7.Can answer the phone call Specification:1.Bluetooth Version: V3.02.Frequency:2.40-2.48 GHz3.Transmission distance: 18M4.Output power: 3W5.Power: USB/DC 5V
Brand Name: HYX Model Number: HYX-BP1490 Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage,Multimedia Channels: 8 (7.1) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Certificate: RoHS CE UL FCC Bluetooth Profile: HFP 1.6 A2DP 1.2, AVRCP 1.4 RF Range: 10-40 M Speaker: 4Ω, 3W Audio Frequency Response: 100Hz-20KHz Loudspeaker Output: 2.5W Signal-To-Noise: >=75Db Distortion: <=1.0% Lithium Battery: 650 mAh Playback Time: 10~12 hours Packaging & Delivery Packaging Detail: Carton Box Delivery Detail: 2-3 weeks after payments Specifications High Fidelity Bluetooth Speaker 1.2.1 + EDR 2.Support TF card, aux in 3.Support talk for handsfree 4.RoHS CE UL FCC Detailed Product Descriptionbluetooth mini speaker 1.2.1 + EDR 2.Support TF card 3.Support talk for handsfree 4.CE,FCC,ROHS High Fidelity bluetooth mini speaker Specifications 1. Bluetooth Ver2.1+EDR (Option)
Brand Name: CASUN Model Number: BS-203 Type: Active Use: Portable Audio Player,Mobile Phone,Computer Channels: 3 (2.1) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) product name: mini bluetooth speaker color: silver,blue,red,gray and so on Speaker output: 4Ω3W with TF card slot: Yes with voice function: Yes FM function: optional effective distance: 10m transmission power: bluetooth class 2 Packaging & Delivery Packaging Detail: Gift Box Package . Dimension:60*60*50mm Q,TY:50Piece/CN Net Weight: 12KGS Gross Weight:13KGS Delivery Detail: 5-7 Days for 100Pcs order /Sample order:3 days. Specifications mini bluetooth speaker mp3 player, Support TF card Excellent sound Fashionable look Bluetooth handsfree funct 2013 Best Outdoor Wireless Bluetooth Speaker with USB and Power Supply Bluetooth ProfileA2DP,AVRCP,HSP,HFP Operation Distanceup to 10 mOutput Power4W Rechargeable lithium ion battery3.7V 1200mA Playback time7-8
Brand Name: OEM Model Number: NS62 BlueTooth Type: Passive Use: Home Theatre,Portable Audio Player,Stage Channels: Other Place of Origin: Zhejiang China (Mainland) color: black Packaging & Delivery Packaging Detail: master carton Delivery Detail: 40-50 days after your deposit Specifications 1. Easy to install 2. High performance 3. ISO9001:2008 New Arrival Rimless Ceiling Bluetooth Speaker Specification: Principle2-way coaxial ceiling speakerBluetooth Specification:V3.0+EDRAudio Input:Bluetooth Iphone&Other devices with BluetoothFrequency range:2.4Ghz Audio Power:AC100-240VWoofer:6.5"Polypropylene cone with butly rubber surround Tweeter:1" silk dome tweeterAcoustic output power:2x30WSensitivity 89 dB@ 1W/1MImpedance:8 OhmsDimension(DiaxD):235x92mm/9-1/4"x3-5/8"Cutout:209mm/8-1/4"Mounting depth90mm/3-1/2"Finished With round or square grille
Brand Name: W-King Model Number: BT03S Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage Channels: 3 (2.1) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Size: 54*44*44mm Color: yellow red blue black white Packaging & Delivery Packaging Detail: blister packing or white box Delivery Detail: 15days after received your deposit payment Specifications hand free bluetooth speaker Phone speaker MP3,MP4,ipod,mobile, phone,laptop CE & Rohs Portable hand free bluetooth speaker round mini black speaker handsfree blue tooth mini speakers MINI BLUETOOTH SPEAKER Overview Astonishing sound quality in a compact console. Introducing e-Storm, LabryrinthX™ super bass speaker. Features -Single-channel portable speaker -Suppporting TF card (maximum capacity can reach is 8G) and with AUX input -Using low-frequency enhancement technology -Using anti-breaking sound's technology -Water resistant -Bluet
Brand Name: SIYN Model Number: BP-205 Type: Active,Bluetooth Speaker Use: Portable Audio Player,Mobile Phone,Computer Channels: 1 Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Color: Black, White, Silver, Golden Packaging & Delivery Packaging Detail: Gift box Delivery Detail: 3-7 days Specifications 1. Best wireless bluetooth speaker 2. Hand free kit 3. Your mobile phone best mate Newest Best wireless bluetooth speakers * Battery capacity:600MA * Power Supply: DC 5 Volt * Output Power: 3w* Driver Unit: 52mm , 3ohms* Frequency Response: 100-18Khz * Carton size:380*360*305mm * Quantity / carton:50pcs * N.W/G.W: 11/12kgs * Accessories : Speakers,2 in 1 charge and line cable
Brand Name: eCandy Model Number: ES-E801 Type: Passive Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage,iPhone,Outdoor Channels: 2 (2.0) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) SNR: â¤85±2dB Color: red, black,silver,blue Charge time: 2 hours play time: 4 hours Hand-free function: Yes Packaging & Delivery Packaging Detail: 1pc/polybag/gift box 50pcs/ctn Delivery Detail: 15-30days Specifications Bluetooth speaker hands free 1.with metal+ABS 2.in gift box 3.hand-free function 4.BQB,CE,Rohs,FCC Stereo portable wireless bluetooth speaker Functions of Bluetooth Speaker:1. Conform to Bluetooth V3.02. Hunan voice pronunciation3. Support hand free calls, and echo weakening4. High quality audio A2DP V1.25. 3W stereo output, and built-in vibration damper, making better low sound quality6. Transmission distance: 10M7. Support line-in 8. Able to connec
Brand Name: Sounder Model Number: Queenbox-classic Type: Active Use: Portable Audio Player,Mobile Phone,Computer,iPad, iTouch, Outdoors Channels: 3 (2.1),2.0 channel with strong bass Special Feature: Wireless,Portable,Mini,Mini System, Wireless System Place of Origin: Guangdong China (Mainland) Player Type: Mini speaker Color: Black Power: Build-in 1500mAh battery Work Time: 10 hours for 70% volume Bluetooth solution: CSR, V2.1+A2DP Microphone: With high quality build-in microphone Weight: 0.365kg Package: Paper gift box Packaging & Delivery Packaging Detail: Paper Box or customized package with your own logo! Delivery Detail: Within 30 days after order Specifications 1. Pure clean sound with strong bass 2. Very cool fashion design 3. With build-in microphone 4. More than 10 hours play time Pure Clear Sound 2013 Newest Wireless Bluetooth Speaker-------Queenbox-classic!Very good sound quality!Better sound quality than Jambox!Can connect with iPhone, iTouch, iPad, iPod, smart
Specifications bluetooth speaker for mobilephones, computer 1) Can play music by link to mobile phone, MP3, MP4, PC, IPOD etc. CE, ROHS Item No.: HS-5093 Desc: bluetooth speaker for mobilephones, computer MaterialABS Color Customised pantone color Size H5.5*D4.3CM Packing details1pcs/color box, Meas: 37*27*16CM/100PCSG.W./N.W.(KGS):8.5/9.5 Logocan print client’s logo Sample time3-7 days OEM acceptedYESCertificate availableCE&ROHSProduction ability10000PCS/DAYPayment termTTFeatures: 1) Can play music by link to mobile phone,MP3,MP4,PC,IPOD and other audio devices, if you devices have 3.5mm socket. 2) Suitable for Promotion, Gift, Store for sell. Pocket size to carry anywhere
Brand Name: OEM Model Number: VS-BS01 Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage Channels: 1 Special Feature: Wireless,Mini Place of Origin: Guangdong China (Mainland) Color: red, silver, black ,blue,Pale gold Output power: 2.0W Internal power: Lithium battery 3.7v/600mA Bluetooth: Bluetooth V2.0+EDR USB charge voltage: DC 5V Dimension: 60*60*50 mm Function: support TF card,USB,FM,MIC, hands-free calling, Bluetooth Speaker Warranty: 12 months Name: Bluetooth Speaker Packaging & Delivery Packaging Detail: color box Delivery Detail: 5-7 days Specifications 1.Mini Portable Wireless bluetooth speaker 2.Support all devices with bluetooth function CE&ROHS Mini Portable Wireless Bluetooth Speaker Basic InformationMaterialStainless steel + ABSAvailable Color white, black, silver, red, blue, gray, gold,bronzeNet Weight240gSize60*60*50 mmLogoOEMAccessoriesUSB cable, audio cable, user manualpacking infoGift BoxBluetooth Specificationv
Specifications bluetooth speaker RF range is up to 10M Ultra-simple style design easy to carry high quality New design wireless mini bluetooth speaker, 2013 hot sale mini bluetooth speaker for phone,ipad etc Specificatoin:
Specifications Wireless Mini Bluetooth Speaker *Builtin Battery *Hand Gesture recognition *MIC talk,TF card play,3.5mm input *CE,FCC Hand Gesture Recognition Wireless Mini Bluetooth Speaker Model No.: GVBS-1011 *Bluetooth speaker with Hand Gesture recognition function.*Aluminium alloy housing.*Support TF card play,3.5mm input, MIC talk. *Mini Size,600mAh built in Li-ion battery.*Color: Black,siliver,rose red,sky blue,gold yellow *Bluetooth 3.0.*Support A2DP.*Built-in Antenna.*Working Distance up to 10m.*Loudspeaker output: 4W max.*Signal Noise Ratio: 80(db) *Working power: 5V 200mA*Product size: φ65mm*H80mm *USB cable charging power.*Use for all device have the bluetoot function,such as for iphone,for ipad,smartphone,notebook ect.*CE/FCC/RoHS compliant.*Packing in gift box.
Brand Name: Opower wireless bluetooth speaker Model Number: OPCC-NB Type: Active Use: Home Theatre,Portable Audio Player,Mobile Phone,Karaoke Player,Computer,Stage,Card Used,Outdoor Channels: 3 (2.1) Special Feature: Wireless,Portable,Mini Place of Origin: Guangdong China (Mainland) Bluetooth protocol: version 2.1 + EDR Output power: 3w*2 Signal/noise ratio: >80dB THD: <0.5% Frequency range: 20Hz to 20kHz Speaker: 40mm *2 anti-magnetism Battery: 2200mAh Re-chargeable Lithium Dimensions: 300g Working period: 5-6 hours Packaging & Delivery Packaging Detail: paper box or customized Delivery Detail: 7-20days Specifications 1.Manufacture bluetooth speaker 2.OEM/ODM is welcomed 3.BQB FCC CE qualified 4.NFC Paring. 5.Touch Control Key Professional wireless bluetooth speaker manufacture factory 1. 2.1 Stereo audio speaker, Mini, portable2.Touch control adjust Key (on/off/up/down/handfree)3. Handfree phone call with integrated echo-canceling speakerphone .4. ABS Case with body UV pa