General Power requirements: DC 12V (power source range: DC12.0-13.8V). GND connection: negative. Maximum current consumption: 7.0A. Dimension: 181*50*165mm (main unit); 183*53*173mm (housing). Audio Maximum power output: 50w*4. Speaker impedance: 4ohm. Bass: ±7dB (100Hz). Treble: ±7dB (10Hz). DVD player section ESP: 4seconds for DVD; 10 seconds for VCD. Signal to noise ratio: 85dB (A). Frequency response; 20-20000Hz. RCA line output; 1.8V max. RCA video output: 1Vp-p. Antenna control: 12V 500mA. FM tuner Tuning range: 87.5-108Hz. Usable sensitivity: 14dB. Signal to noise ratio: 60dB. Harmonic distortion: <1% (1kHz). Frequency response: 30-15000Hz. Separation: 35dB (1kHz). AM tuner Tuning range: 522-1620kHz. Usable sensitivity: 36dB.