Cheap Manufatuer video doorphone for apartment

video doorphone Advantage : 1.The system include 1outdoor unit +1pcs indoor monitor ,support 1building which have 2households 2.4-wire operation ,but still very easy to install. 3.audio & video transmission ,unlock and hand-free user friendly design 4.Multi-intercom ,each household can connect 1-4pcs monitors. Description: Host camera Type: direct press-host camera Feature: Direct press-host camera with 1pcs call button Installation in: outdoor or main entrance Material : plastic + Alloy Easy to installation : 4wire cable to connect camera from the monitor Suitable for : Small apartment building,villa area,can support 2pcs apartments/flats