Zhudele ZDL-3208C two way video door phone system has voice clarity, door phone ABS plastic housing, adapter input dual voltage AC100-240V 50Hz-60Hz, adapter output voltage DC15V 1500mA, talk time delay 120S ±10%, monitor time delay 40S ±10%, dissipation stand by<0.5W, working <10W, working temperature -35℃~55℃ and relative humidity 10%-90% RH.