Product Introduction:  1. This device is a Bluetooth MP3 player developed for car-used,which equipped with professional     high-performance Bluetooth module and MP3 decoder chip.  2. It can play and transmit the music from TF card to car stereo via FM radio signal,can transmit your     mobile phone's music to car stereo via Bluetooth,also can be used as a hands-free car kit during driving.  3. This device transmits signal by wireless method,no need to modify anthing in car.It can be used     both as the music player in entertainment purpose or hands-free car kit in safety purpose during driving.     Feature:  1. Support Bluetooth hands-free phone calling via its build-in microphone.  2. Noise and wind suppressed by CVC technology to create full duplex sound quality.  3. Support mobile's A2DP function. Music will be played directly while the mobile phone is connected.  4. Mobile phone can be connected automatically when the device turns on.  5. Support an extermal TF card, can play music files in MP3/WMA format.  6. Intergrated car charger of output 5V - 1000mA, is available for charging handheld device in car.     Specification:   Input Voltage: 12 ~ 24V.   Output Voltage: 5V ± 0.25.   Outout Current: 1000mA (Max).   Short Circuit Protection Current: 2.4 A ~ 3 A.   Bluetooth:   Bluetooth Version: V3.0 + EDR.   Frequency: 20h ~ 20KHz.   Sensitivity: - 42dB ± 3dB  360.   Voltage: 5V ± 0.5.   Working Current: 45mA (Max).   Stand-by Current: 25mA (Max).   Frequence: 2.402 ~ 2.480gHz.   Effective Range: 5M.   Sensitivity: - 92dBm.   RF Output: 4 dBm.  Frequencies:   FM: 87.5MHz - 89.0MHz  890.5MHz - 102.0MHz - 105.8MHz - 107.5MHz.   Transmitted Power: 87 dBuv / 107 dBuv.   Effective Range: 2M.     Note:  This device is compatible with most of the mobile phones, except of a few mobile phones that are not available to use parts of above functions.     Package Included:  1xBluetooth MP3 player