The motion sensor detects movement in front of the sensor, a bit like a sensor that turns on a security light. The sensor itself is silent. It is supplied with a stand, so it can be positioned in any location with a flat surface.
For example, it could be positioned against the bed, to pick up movement when a person gets out of bed:
It could also be positioned next to a door:
It is powered by 2 x AA batteries (supplied) which will last for about 2 months.
The sensor contains a radio transmitter that is linked to a pager. The pager can be used up to 200 meters away and it will vibrate, flash and beep when it receives an alert. The pager is powered by 1 x AAA battery which will last for about 1 month.
When the sensor has a low battery, a blue light on the sensor will flash.
When the pager has a low battery, an orange light will flash on the front of the pager.