Magnetic Contact: With the extractor hood switch set, you can ensure that your extractor hood can only be used when the window or door is open. Long Range: Range up to almost 30 meters indoors, up to 200 meters outdoors (without obstacles). The power of household appliances is 3600 W. Plug and play: the socket and radio sensor are already paired. 2 x AAA batteries are required for the operation of the radio sensor (not included) Easy to install: the delivery includes 2 x 3M adhesive and 4 x screw set. You can choose the installation method of the paste or attach it according to your own needs with screws. Make your life more convenient: suitable for light circuits, e.g. the light should turn on when you enter a room. Suitable for monitoring the garage door, when the gate is open, an indicator light should signal this. The window contact switch is ideal for your smart home life.