Color video door phone for Villa TG515-8C

TianGang Electrical International Co.,Ltd specialized in manufacture Video door phone for villa in best quality and most competitive price. Welcome to contact me for further information.
One outdoor unit can connect with 1 to 2 indoor units. If needed, it can be extended to 2 door stations support up to 3 indoor phones.
Specifications:
Power source: AC110V~240V
Screen: LCD 3.5inch or 5inch
Monitor/Speaking timing:1/2minute
Resolution: 480(H)?34(V)
Working temperature: -15C~+50C
Input/output: 1Vp-p / 1Vp-p,75Ω
Dimensions of indoor unit: 185(L)?30(W)?7(H)mm
Dimensions of outdoor unit: 127(L)?5(W)?5(H)mm
Installation: wall mounted
Connection: 4 wires