... digital video door phone Advantage:Indoor unit with 3colors available : Black,White or Red .Waterproof outdoor camera,use it outside Photo function ,record the ... 3.5inch TFT color display .Easy to install, no wiring required for monitor, place it anywhere Rain-proof camera ,it work with ... .1to 1,1to 2,1to3,1to 4 are available .Monitor color available: grey ,red or whitePass CE,ROHS approval