... Good wireless video door phone with memory, One outdoor camera works with one, two,three, four, five, six indoor ... one model you like!3: Two outdoor cameras works with one, two ,three, four indoor monitors ... meters distance, Stable, Call,monitor,intercom, unlockOne camera can connect to 4 monitors and one monitor can ... ( 20sets) NW: 15 KG GW: 16 KG Camera 0.20kg + Adapter 0.26kg,Monitor:0.18kg ...