Product Description:  Bluetooth: Version 3.0 (supports A2DP; AVRCP)Support: MP3, WMA Audio format via AUX-IN/USB/TF  Card Slot;  USB output Charging MIC Effective Range: 0.5 ~ 2M SNR:  >80dBTHD: <0.1% Frequency Response: 20Hz~20KHz Input: DC 12V-24V Output voltage: DC 5V 2.4A USB Sport: Single USB  Features:1. Wirelessly transmit phone call from Bluetooth mobile phone to the car FM stereo system 2. Single USB output to charge external devices (DC 5V/2.1A).  3.Power Supply by the cigarette socket in the car (DC 12V/24V) 4. Supports TF Card Slot/AUX-IN;5. Switch to Hands-free mode automatically from music playing status when receiving calls;  6. Draws power from the cigarette socket in the car;7. With LED display;8. Full range of channels optional from 87.5-108MHz Package including: 1*Car Bluetooth FM Transmitter