Zhudele ZDL-3208C two way video door phone system has two way intercom, one way call and lock function, voice clarity, door phone ABS plastic housing, two wire connection, 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, effective distance of 300 meters above intercom.