Aqara Zigbee Door and Window Sensor
A two piece contact sensor that reads open and closed and pushes an alert to your phone the moment something opens that should not be, and can set off the hub's own alarm at the same time. It tolerates a gap of up to 0.86 inches, which is what lets it work on drawers and cabinets as well as doors. Runs on Zigbee through an Aqara hub, sold separately, and once it is on there it works with Apple HomeKit and Alexa.
What you're getting
- Two piece contact sensor that reads open and closed and pushes an alert to your phone
- Can trigger the hub's own alarm on an unexpected opening
- Tolerates a gap of up to 0.86 inches, so it also suits drawers and cabinets
- Needs an Aqara hub, sold separately, and runs on Zigbee rather than direct Wi-Fi
- Works with Apple HomeKit and Alexa once it is set up on the hub
Why we picked it
Most smart home spending goes on things you operate. A contact sensor is the opposite: it costs almost nothing and it tells you about a state you would otherwise only find out about later, like a back door that never fully latched on a cold night. Buy it knowing it is not a standalone gadget, because it needs a hub to talk through. If you already run one, this is among the cheapest useful things you can add to it.
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