Wireless roller or tilt door sensors are used to detect when a door is opened. These are called Reed switches. They consist of the Reed switch sensor and a magnet. The Reed switch is secured to the floor and the magnet is fitted to the door. When they are separated the sensor sends a signal to the alarm control panel. If the alarm system is armed it will be triggered.

Specifications:
Transmission range: 40 metres (open area)
Transmission range: 30 metres (through two walls)
Battery Type:  1 x 23A Alkaline
Battery life: 1 year
Battery Type:  1 x 23A Lithium
Battery life: 4 – 5 years