Comprising of MPPL Pager and a door/window sensor. This kit is ideal for monitoring internal and external doors and windows. The door/window contact sensor is powered by 1 x 9v battery (included), with an open field range of 120m, and once triggered sends a signal to the pager which can be set to vibrate only, vibrate with a low tone or vibrate with a high tone. Up to ten sensors can be used with one pager, which can be worn on a belt clip or on a lanyard. It has an open field range of 120m. The pager uses 2 x AA batteries (included) and additional units can be linked into the kit.