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  This 5 pack of door/window sensors is a great option is you have multiple doors and windows to protect. They are used to detect when a door or window is opened. These are called Reed switches. They consist of the Reed switch sensor and a small magnet.
The Reed switch is placed on either the frame of the door/window and the magnet on the opening part of the door/window. When they are separated the sensor sends a signal to the alarm control panel. If the alarm system is armed it will be triggered.
| Specs | |
| Model | DWC-102 | 
| Wireless Working Frequency | 433MHz ��� Approved for AU & NZ | 
| Wireless Transmission Range | Approx. 25 metres through two walls | 
| Size | 3.3cm x 7cm x 2cm / 1cm x 5cm x 1.5cm | 
| Battery Type | 1 x AA | 
| Battery Life | 1 - 2 years | 
| Warranty | 2 years |