Features: Bluetooth-compatible 5.0 Chip: The Bluetooth-compatible 5.0 chip is compatible with earlier versions and is intended for low-power devices while maintaining high-speed transmission. 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. Hands Free Calling:This player can achieve Bluetooth-compatible hands-free calls and can answer calls with just pressing the button. Suitable Cars: This player is suitable for 12V-24V cars on the market and is compatible with multiple apps. Attention: Do not use on large trucks that are actually greater than 32V. 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 Support: USB Flash Drive/TF Card 32G Transmission Frequency: 87.5MHz-108MHz Power Supply: DC5V Output Current: 3.1A 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 "Products from KJ's store