Product Description:1), Bluetooth 3.0 standard (A2DP; AVRCP)2), Audio transmission: lossless transmission, standard 3.5mm audio output port3), Compatibility: Bluetooth version4), Application Range: All Car audio with IN AUX audio input5), Bluetooth hands-free function6), Support for common functional control functions (such as play / pause; upper and lower, etc.)7), Support for remote control functions (optional)9), Key backlight design, easy operation10), 5V / 2.1A OutputSpecification: electrical index:1), input: 12~24V2), output: 5V/2.1A3), >92dB SNR:4), THD:<0.05%5), Response: 20Hz~20KHz Frequency