Working voltage: 12VWorking voltage limit: 9-26vUSB output: 5V / 2AWorking temperature: 0-50 degreesSupport playback format: MP3 WMASNR: 60dBDistortion: 0.1%Frequency response: 20hz-15khzSeparation of left and right channels: 60dBBT version: version 2.1 + EDRBluetooth sound processing: A2DP (advanced audio distribution profile)Bluetooth transmission distance: 10MEffective range of Bluetooth microphone: 0.5-2mFM transmission frequency: 87.5-108mhzFM transmitter mode: PLL stereo digital lock