This car MP3 player is equipped with high-performance MP3 chip, it supports playing music files of USB flash. Simple operation brings you instant music enjoyment. Just plug it into the cigarette lighter socket, turn your car FM , an empty frequency, and match it to this transmitter. Pair the music player with your phone via to realize , then there you go! Feature - : Stream music and calls directly from your mobile devices to car stereo system via FM ( 87.5-108.0MHz). - hands-free call: to make, answer or reject calls after the unit is connected with your phone via . Automatically between music playing and hands- . - Dual USB output: Support charging two devices simultaneously by the dual USB ports with 2.1A total output . - USB player: Download your favorite songs in the USB drive and insert it into the USB port, then it will play the MP3 files automatically. - music player: Support A2DP, direct playing high-quality music and voice navigation of your mobile phone. - AUX IN music playing: Included audio cable allows you to connect the and MP3, MP4, phone or any other audio device via the aux ports. Using steps: 1) Plug the into your vehicle's cigarette lighter or . 2) Tune your to an unused FM frequency , then match the and car FM at same frequency. 3) Please make sure the feature on your device is turned on and then connect your device and the car audio adapter via blutooth. Specification - Color: Black - Material: ABS - Size: Approx 11.5 x 2.5 x 1.8 cm - Frequency Response: 20Hz-15Khz - Transmission Frequency: 87.5-108.0 MHz - Supported Format: MP3, WMA - Operating Voltage: 9-26V - USB output: 5V / 2.1A ( .) - Version: EDR - Transmission Distance: 0.5m-2m - Support USB drive: Up to 16GB - Audio distortion degree: 0.1% - Work Temperature: -20-50 Celsius degree - Multi-function: On/ off, Previous/ Next song, Volume up/ down, Answer/ Reject calls, call. Package list: 1 x MP3 player 1 cable 1 x User manual