` 2.4Ghz wireless freq, open distance:180-400m;

` Built-in backup battery for indoor phone;

` Maximum 1 cameras and 4 monitors at same time in a system;

` With function of taking pictures; 

` 100pcs of pictures can be stored; 

` Touch key,7-inch digital screen;

` With a call, intercom, unlock, monitor, infrared night vision function;

` Outdoor station battery can be used for 180days under standby mode;