Features: Hands Free Calling:This player can achieve Bluetooth-compatible hands-free calls and can answer calls with just pressing the button. Bass Surround: 360 bass surround throughout the vehicle with clear sound quality. Bluetooth-compatible connection is fast and transmission is stable. Atmosphere Light: The player is equipped with atmosphere light paired with bass 360 surround sound effect to make your journey no longer lonely. FM Frequency Modulation: Adjust the frequency of the car radio to the local frequency point where there is no radio station and then adjust the frequency of S-21A to match the frequency of the car radio. After-sales Service: If you have any problem please contact us immediately we will help you solve it as soon as possible. Specifications: Material: ABS Bluetooth-compatible Version: 5.0 Bluetooth-compatible Transmission Distance: 10m Working Voltage: 12V-24V USB Output: 5V=3.0A USB-C Output:5V=3.0A FM Frequency: 57.5-108MHz Notes: Please note that due to the influence of light and screen slight chromatic aberration is acceptable. Please allow slight measurement error due to manual measurement. includes: 1 *Car MP3 Player "