This product is a vehicle for bluetooth Car MP3 player, professional-grade high-performance bluetooth module, MP3 decoder chip, transmit to the car stereo via FM radio, if you take a bluetooth enabled mobile phone to connect to the device during a call can be automatically switched to hands-free calls in the state, the call ends and then automatically switches back to the music player; you can also phone MP3 music transmitted wirelessly transmitted to your car audio, no modification of your car, you can let you enjoy music while driving can also be applied hands-free cell phone calls, entertainment security correct, perfect human design. Specification: Color: Black. Main Material: ABS. Display Screen: Led Digital Display Screen. Dimension (Approx): 7.6(L)x4.2(W)x3.5(H)cm / 3(L)x1.65(W)x1.38(H) inch. Wire Length (Approx): 2.76inch/7cm. Band: FM Frequency. FM Frequency Range: 88.1~107.9 MHz. Interval: 0.1 MHz. FM Operating Distance: 15ft / 4.5m. bluetooth Specification: V4.0. Blue Profiles: HSP, HFP A2DP and AVRCP. bluetooth Operating Distance: About 30ft / 9.1m. Input Port: Car Cigarette-lighter Socket. Aux in: 3.5mm audio port. Input Voltage: 12~24V. USB1 Output: 5V/2.4A Max. USB2 Output: 5V/1A. Package Included: 1xbluetooth Wireless FM Transmitter Dual USB Car Charger. 1xInstruction Manual