Features: 1. Integrate handsfree calls, FM transmitter, Bluetooth, USB charger and MP3 player2. Wirelessly deliver phone calls from Bluetooth-enabled smartphone to car stereo3. Built-in FM transmitter, 87.5-108.0MHz of full frequency4. Built-in microphone allows you to speak to callers without picking up the phone5. CVC technology for noise and wind suppression, full duplex sound quality6. Support mobile's A2DP function, play music automatically when the phone is connected7. Auto pairing once it is turned on8. Play MP3/WMA/FLAC files directly from external TF card9. Built with 3.5mm jack, support line-in and line-out10. Well-positioned buttons for quick music and call control, volume adjustment knob11. Offer a 5V-2.1A USB port for cellphone or tablet charging12. 1.44" large screen display, easy operation Specifications: Supply Voltage: 12-24VOutput voltage:5V /-0. 25VOutput current:2100mA(MAX) Short circuit current:2. 4-3mABluetooth Version: V3.0 EDRFrequency: 20Hz-20KHzSensitivity: -42dB /-3dB 360Voltage: 5V /-0. 5VWorking Current: 45mA (Max) Standby Current: 25mA (Max) Frequency: 2.402-2. 480GHzEffective Distance: 5mSensitivity: -92dBRF Output: 4dBmFM Frequency: 87.5-108. 0MHzTransmission Power: 87dBuv / 107dBuvColor: BlackWeight: 75gDimension: 85*50*15mmMaterial:ABS