Features: 1) With basic functions, easy to operate and the price is competitive2) Can record message which can't be lost once the power is off3) 6 phone numbers can be set to call when alarm goes off4) Long distance arm, disarm and monitoring functions 5) The system can adjust the code, reduce or add the detectors according to user requirements6) When triggered, the alarm call can has priority over normal calls7) Built-in battery ensures continued working for 24 hours once power is off and recharges once the power is back on8) Kit contents: one host, one PIR detector, one door sensor, one adapter, one external siren, two remote controls, phone wire producing area:China