Slim magnetic sensors that tell you the moment a door or window opens, and can trigger lights or an alarm through your hub. Year-long battery, adhesive fitting, no drilling.

Key specs • Pack: 3 sensors and 3 magnets • Detects: door or window opening, instant alert • Battery: CR2032, roughly 12 months each • Size: 4cm slim body, adhesive fitted • Requires: Zigbee hub

In the box 3 sensors, 3 magnets, 6 adhesive pads, batteries

UK notes Can trigger more than an alert - use one to switch on a hall light when the front door opens, or to warn that a window is open while the heating is on.