Power Source AC100~220V , 50/60Hz System type Stand-alone Extension Unit DPV-4HP2:DP-4VR/4VH/4HP(Interphone) APV-4HP2:CLS-10(Guard station unit) Mounting type Wall surface mounted type Display 10.16cm (4") B/W CRT

Power Source AC100~220V , 50/60Hz System type Stand alone Extension Unit DP-4VR/4VH/4HP(Interphone) Mounting type Surface mounted type Display 10.16cm (4")B/W CRT

Power Source AC100~220V , 50/60Hz System type Stand alone Extension Unit DP-4VR/4VH/4HP(Interphone) Mounting type Surface mounted type Display 10.16cm (4")B/W CRT