GTO Wireless Keypad w/ Intercom, GTO F3100MBC Estate Series Increased Surveillance: Screen visitors and solicitors safely from inside your home Superior Range: Crystal clear two-way wireless communication up to 500 ft. (152.4 m). Stand Alone Keypad: Program up to 100 entry codes for added security Motion activated backlit keypad IDEAL FOR SECURING GATE ENTRANCES WHILE PROVIDING CONTROLED ACCESS