3.5 inch digital wirelessl video doorphone,wireless distance 250m,with callling, intercom, wireless unlock , monitoring, super IR night vision,autumatic recording function, autumatic take photo 100pcs functions. Indoorphone with touch bottons.            Max: 3 indoor monitors+1 outdoor cameras           outdoor station can used with battery, in the power saving mode can be used for more than 180 days or more