Check visitors on Wireless Monitor, respond promptly and talk from living room, kitchen, everywhere home and while you are doing something else. UP to 6 wireless monitor connectable. Max wireless range is 100m with no obstacles. You can add on repeaters expand the range. UP to 2 DECT repeater connectable. If features a large, 5 inch wide screen that clearly shows each visitor's face. You can simply touch the screen to activate an approximate 2x zoom horizontally and vertically. The gate or door lock can be easily and quickly released even from the second floor of the house. It allows you to automatically record video images of visitors to SD card. It will record up to 3,000 visitors (30 seconds per visitor). (The SD Memory Card is sold separately.)