Features:Bluetooth hands - free calling.Support charging the mobile phone. Phone will never have no power in the car.Echo cancellation and noise suppression technology. (when car is with speeds of up to 100 yards、 there will have no echo by using the Bluetooth phone.)Stereo Bluetooth and FM transmitter technology.Support USB.Support MP3、 WMA format music.Automatic power-off memory function.Car cigarette lighter power supply directly. Specifications:1. a2dp function. Phone with a2dp function (also means stereo Bluetooth)、 may be able to play music in your phone through the car stereo AV connectivity (some phones expand playback music called different names、 the same connection method as described above).2. Different phones can be connected to different Bluetooth services simultaneously、 but at the same service can only connect a cell phone. Such as A phone connected phone calls、 B to connect to the phone calls must take the A phone is disconnected、 but the function (in the case a2dp A feature phone is not connected) B phone if a2dp、 B phone can single connection a2dp function. A phone call that is hands-free、 B phone can play music through the Bluetooth player. In this case、 if an incoming call or make a call、 the phone will automatically take precedence. It will be automatically transferred to a2dp playback after the call ends.3. Priority: different functions are used in the case of priority as follows:Phone calls> a2dp player、 U disk music player.Click priority order、 any high-priority function is activated、 the low priority will be suspended after the end of the high-priority features、 low priority will be restored.Type: Bluetooth Handsfree PhoneRated Working Voltage: 12VLimit Working Voltage: 9-26VWork Rate Consumption: 1WOperating Temperature: 0 to 50 degreesSupport Playback Format: MP3、 WMASNR: >60dBDistortion: <0.1%Frequency Response: 20Hz-15KhzLeft and Right Channel Separation: >60dBBluetooth Version: 3.0USB Output: 5V/2ABluetooth Sound Processing: with A2DP (Advance AudioDistribution Profile) FunctionBluetooth Transmission Distance: 10m-15mFM Transmitting Frequency: 87.5-108.0Package Includes:1 x Bluetooth Handsfree Phone1 x 3.5mm Audio Cable1 x User Manual