JaJaBor FM Transmitter AUX Audio Receiver MP3 Player Dual USB Charger TF Card U Disk Handsfree Bluetooth-compatible 5.0 Car KitThis 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 phones 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 mobiles A2DP function. Music will 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 play music 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 + EDR 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 RF Output: 4 dBm Frequencies: FM: 87.5MHz 108.0MHZ Transmitted Power: 87 dBuv / 107 dBuv Effective Range: 2 meters PackageIncludes: 1*wireless handsfreeFM Transmitter 1* Air vent clip 1* Audio cable 1* User manual