Technical specifications of the DC voltage: DC18V Sensitivity: ≤30mV Operating Current: 160 mA Quiescent Current: 30mA ring time: 30 seconds of talk time: 90 seconds (press 0-9 button to ting long talk time) frequency response: 300 ~ 3400Hz ± 3db Output Power: ≥100mW Audio Output: 50mW Distortion: <5% Resolution: 700TV Line Camera Minimum illumination: 0.1LUX viewing angle: 98 degrees wide-angle video output: 1Vp_p / 75Ω Ambient temperature: -40 ℃ ~ 55 ℃ Relative Humidity : 20% -95% of the surface dimensions: 366 * 137 * 50mm dimensions: 347 * 127 * 40mm Installation: Embedded