Features: Built-in stereo FM transmitter Using advanced noise reduction and echo cancellation technologies Function is adjustable via remote control Liberating your hands from holding mobile phone during talking a call None of the coming calls could be missed during enjoying the MP3 player Hi-Fi sound-effect of the signals received and transmitted Display and store channels, volume and track information of songs Remote controller provided to use safely and comfortably Line-in connector for audio players Plays music stored on compatible Bluetooth stereo (A2DP) devices One key to answer / reject / pair mobile phone Auto-play music after call ends Support USB / SD card, MP3 and WMA format Apply to USB device and MP3 player Power supply from car cigar lighter Color: silver Instructions: Turn on your car stereo and tune to the same frequency as your car MP3 player. Plug in SD card. Plug USB device into car MP3 player. Plug car MP3 player into cigarette lighter of your car directly. Press the play button of the car MP3. Technical Features: Power consumption: 1W Rated voltage: 12V Limit voltage: 9-26V Work temperature: -20~50C Distortion factor