... as a wireless telephone by using keypad to make calls, (850/900/1800/1900MHz) Module10.One-key-control: out arm, home arm, arm by ... Current <450mAWireless Frequency 315/433MHz, PT2262/EV1527, 4.7MΩGSM Frequency 900/ 1800MHz (quad-band optional)Back-up Battery NI-HI AAA ... Configuration :Smoke Detector,Glass Sensor,Panic Button, Wireless keypad… New GSM alarm system with LCD display and Touch keypad