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 meters (open area)Transmission range: 30 meters (through two walls)Battery Type: 1 x 23A AlkalineBattery life: 1 yearBattery Type: 1 x 23A LithiumBattery life: 4 – 5 years