... to 300m;(2) Infrared light of peephole can capture image in low-illumination environment;(3) Monitor, unlock, talk, 16 piecesof chord ... peephole, indoor monitor and wireless unlock control.Peehole can install in variable types of doors(the door thickness ranges from 35 ... diameter 35mm, extended pole with diameter 24mm, flexible PCB extended line, fixed pole A, B, C.(4) Battery of peephole and indoor ...