video doorbell,color video door phone,video intercom system,3.5" indoor unit,2.4GHz hopping frequency,120-200M remote range,OEM video ... doorbell,color video door phone,video intercom system,3.5" indoor unit,2.4GHz hopping frequency,120-200M remote range,OEM ... Specifications:3.5" TFT LCD Screen;Remote Range:200M(in open area ...