Intercom aaphone among houses, door surveillance , remote unlock. ... Item No.:T1 -1( TCP/IP )Screen:7’ color normal screen with keysTemperature:-20°C~+50°CCom. port:10M ... operation. TCP/IP communication, stable signal, multi functions.Functions :Intercom :phone among houses, door surveillance , remote unlock. Security surveillance ... control e elevator in room . 7 inch color wired video doorphone