This is the Konig Wireless alarm system [SAS-ALARM120] Plug and play wireless alarm system. Easy and quick installation. Secures houses, offices, shops, etc. in just a few minutes. The main unit has a 100 dB siren and LED indicators which display which sensor is triggered. Complete with 3 wireless door/window sensors for securing doors and windows and 3 passive infrared (PIR) detectors. Door/window sensors can be switched to RF or RF + alarm. Switched to RF + alarm activates a 95 dB siren. Supplied with 2 RF controlled remote controls to arm or disarm the system. Function switch on main unit for alarm or door bell use (chime). Batteries for the sensors and the remote controls are included. ...Contact us if you need more help.