Description FM Transmitter AUX Audio Receiver MP3 Player Dual USB Charger TF Card U Disk Music Handsfree Bluetooth-compatible 5.0 Car Kit This device is a BT MP3 player developed for car-used, which equipped with professional high-performance wireless module and MP3 decoder chip. It can play and transmit the music from TF card / U disk to car stereo via FM radio signal. It can transmit your mobile phone's music to car stereo via BT. It can also be used as a hands-free car kit during driving. This device transmits signal by wireless method, no need to modify anything in car. It can be used both as the music player in entertainment purpose or hands-free car kit in safety purpose during driving. Product Function 1. This equipment can detect battery's voltage. 2. Support Bluetooth hands-free phone calling via its build-in Microphone. 3. Support mobile's A2DP function. Music be played directly while the mobile phone is connected. 4. Mobile phone can be connected automatically when the device powered on. 5. Support an external TF card / U disk, can files in MP3/WMA format. 6. Integrated car charger of output 5V - 2100mA, is available for charging handheld devices in car. Bluetooth: BT Version: V5.0 + Frequency: 20 Hz ~ 20 KHZ Sensitivity: -42db + / 3 db 360 Voltage: 5 v + / -0.5 Working Current: 45mA (max) Stand-by Current: 25mA (max) Frequency: 2.402 ~ 2.480 GHz Effective Range: 5 Meters Sensitivity: -92 dBm Output: 4 dBm Frequencies: FM: 87.5MHz - 108.0MHZ Transmitted Power: 87 dBuv / 107 dBuv Effective Range: 2 meters Color: Silver Material: ABS Package Contents: 1*Car FM Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.