Features: Wide Compatibility: It is compatible with multiple charging protocols and can support multiple devices charging simultaneously with intelligent shunting that does not harm the phone. Safe Charging: The FM transmitter has built-in overcurrent protection overvoltage protection overcharge protection overload protection overheat protection and short circuit protection to ensure the safe charging of the radio adapter charger. Intelligent: Built-in chips provide stable connection for streaming music and hands-free calls. Built-in microphone supports intelligent voice navigation of mobile phone. Stereo Surround: The adapter isBluetooth-compatible and has360 stereo surround synchronous output without delay and clear sound quality. 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 Frequency: 20Hz - 15KHz Bluetooth-compatible Version: 5.0 Transmission Distance: 5-10m Working Voltage: 12V-24V Audio Format: MP3/WAV Standard Edition Output: 5V/3.1A Quick-ChargeEditionOutput: PD 25W 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 "