Long range singnal, the door sensor built in long antenna, can covers up to 2,500sq. ft. You can Choose the Alarm kit that fits your needs and add additional components and accessories at any time. such as motion detector, shock sensor, range extention, water leak sensor etc. Power goes off and comes back on send SMS function, with a backup battery, no longer have to worry about burglar cut off the power and make the alarm failure, Arming and alarm deactivation can be conveniently done by remote control, app rfid card or call. The home alarm system can add a total of up to 100 sensors and 2 wired sensors, no longer have to concern about leaving the door open and always think about the home will enter the burglars, Independent zone delay alarm and arming. Support WIFI and GSM dual network(you can use GSM if there is no WIFI, The WIFI only can work with 2.4G, not work with 5G), Different alarm status: away arm, home arm, delay arm and timely arm. No hidden costs and subscription fee: No contract with security company with Free app, your alarm kit includes 1 alarm host,1 motion detector, 2 remote controls, 10 door/window sensors, 2 rfid cards and 1 wired siren, all come with the required batteries.