Introduction:This product is blue-tooth car charger mp3 player for vehicle. Adapting professional-grade high-performance bluetooth module, built-in mp3 decoder chip make it capable of playing the music files in u disk, firing into the car stereo via wireless. Besides, during the bluetooth connecting, play the phone’s music and FM transmitter to Car Audio, as the calls incoming automatically switches to the speaker state, call end then automatically back the music player. So you do not do any modifications, easily enjoying the music and handsfree phone calls while you are driving.: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. Operation Introduction:1. Play the Music:Insert the product into the car cigarette lighter socket, then insert MP3 into the appropriate socket, the player will enter to play state automatically after detecting the music files, press Play / Pause to switch.Turn on the car stereo to FM radio mode, then adjust the reception frequency of car audio and car radio transmission frequency to same, car stereo will play the music machine.2. Adjust the Transmission Frequency:Press the "FM" and keys to adjust the frequency of the FM transmitter between 87.5 ~ 89.5 ~ 90.5 ~ MHZ. Long press and then quickly adjust.3. Short press button or key, you can play the previous song or next song, long press the volume down and volume increases.4. How to Use Bluetooth Handsfree Function:The first time you use the speakerphone need to code. The method for code is: open the phone's Bluetooth function and search, after the phone searches for Bluetooth phones successfully, it will bundled machine, then you need to enter the initial password 0000 bundled in the phone. You can make and receive calls via speakerphone after the connection is completed.If the phone with the hands-free player already had code, phone settings allow automatic connection of Bluetooth, when power on the speakerphone will automatically connect to players and mobile phones. (If the phone is set not to allow automatic connection of Bluetooth, the phone will be prompted to connect or not, different phone models will be slightly different.)Phone calls when your Bluetooth MP3 is playing music, the player will automatically switch to hands-free mode, press the answer key to the Bluetooth hands-free calls, end the call and then automatically switches back to the music player state, you can press the Bluetooth key to hang up to end the call directly answer.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 , 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: 87.5-108.0