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Technical Parameters: Rated operating voltage: 12V Limit working voltage: 9-26V USB Output: 5V / 3.1A Operating temperature: 0-50 degrees SNR:> 60dB Distortion: <0.1% Frequency response 20HZ-15KHZ Left and right channel separation> 60dB Bluetooth version: version 2.1 Bluetooth sound processing: With A2DP function Bluetooth transmission distance 10M Bluetooth microphone effective range 0.5-2M FM transmission frequency 87.5-108Mhz Transmit FM stereo digital PLL frequency lock mode Weight: 55 grams Packing Size: 143 * 68 * 36mm Feature1: LED display window2: Bluetooth hands-free 3: Bluetooth stereo music play 4: Call Echo Cancellation and Noise Reduction (CVC) technology 5:Dual USB output. total output 5V/3.1A 6: Bluetooth stereo and FM transmitter 7: Automatic memory function of power failure