KERUI Touch LCD GSM Wireless Home Burglar Security Alarm System Kit 8pcs Detector Sensor + 10pcs Wireless Door/Window Gap Sensor Elegant and advanced touch keypad for easy operation; 128x64 lattice LCD screen with clock display. Remote monitoring. Call the system anytime and check status, remotely arm or disarm the alarm and use the intercom function. The main device can dial alarm calls to 6 preset phone numbers. Totally wireless system with built-in GSM dialer. Activates siren then dials your phone or sends a text message in case of intrusion. With the One-Key-Control function, you can conduct Away Arming, Home Arming, Remote Control Arming or Off-site Telephone Arming.