Description: Car Bluetooth hands-free calling, built-in high-sensitivity microphone, HSP call noise floor and echo suppression. Bluetooth A2DP, two modes of connection to smart phones to play music: FM transmission to car radio, playback through car audio system, wireless stereo. The AUX audio cable is connected to the AUX audio hole of the car, with an audio isolator, to eliminate the noise of the car loop, and perfectly present the lossless sound quality (the car needs to have an AUX interface and the location is suitable for audio cable connection) Support TF card playback, plug and play. Support USB power supply, any 5V charger, car charging USB interface can be used. Home 5V adapter can also be used, can upgrade ordinary speakers to Bluetooth speakers Knob design, one-key operation to adjust the volume / answer / hang up / call back. There is a magnetic adsorption base on the back of the fuselage Specification: Material: Plastic Electronic components Cable Length: 1.4 meters Bluetooth Version: 4.1 Transmission Distance: 10 meters Applicable Models: 12V/24V car Highlights: AUX Play, FM Transitter , TF card play, Hands-free Size Chart: 50x50x27.5mm/1.97x1.97x1.08inch Package Includes: 1 Piece Bluetooth Car MP3 Player Kit 1 Piece User Manual Note: Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!