Bluetooth Headphones/headset Hidden/with Mirophone For Iphone/phones

Brand Name: Sinoband Model Number: HTH-021BT Style: Headband Communication: Wireless Connectors: Bluetooth Use: Mobile Phone Function: Bluetooth Place of Origin: Guangdong China (Mainland) Color: Green Packaging & Delivery Packaging Detail: Blister Packing 40pcs/carton Size:42*35*34cm G/W:7.5KG Delivery Detail: 5-10Days Specifications 1.Bluetooth headphone 2.Hidden omni-directional Microphone 3.10m 360 degree range with no cords Built-in rechargeable battery 1:  Bluetooth 2.1 wireless transmission protocol                                             2:  Transmission distance and range(10m,  360°)                                                                                                           3:  High SNR Bluetooth audio connection 4:  No wire,no transmitter,no software,no setup, it is easy and fast.  5:  Automatic Switch-over between calls and music   6:  Hidden omni-directional Mircrophone                                                          7:  Low power indicater8:  Adjustable headband9:  Working duration:10h,charging duration:2h10: Headset Spec.: frequency response:20-20KHz,SRN:85dB,working Voltage:3.7V,current:30mA speaker size:Φ30mm11: Microphone Spec.:100Hz~10kHz&SRN≥55dB&Sensitivity:-42dB Packaging list:  Wireless Headset, charger,instruction book