SwitchBotDoor Alarm Contact Sensor - Smart Home Security Wireless Window Alarm and Door Sensor, Add SwitchBot Hub Mini to be Compatible with Alexa (1 Pack)

Switchbot's Contact sensor is useful in many situations. It's easy to install and the Switchbot app provides settings for it to be used on a door or a cupboard. I even have one attached to a cat flap!Battery life is good and, as well as linking to the Switchbot app, I have also connected the contact sensor to the Samsung Smartthings app which allows me to control non-Switchbit bulbs via the sensor.The sensor also includes a small motion sensor which allows you to determine if visitors are leaving or arriving alongside a light sensor.I have found that notifications via the Switchbot app can be delayed (despite disabling battery optimisation etc) but they come through instantly via Smartthings.I have purchased contact sensors from other manufacturers in the past but this is the most versatile by far.

Exactly what you'd expect from SwitchBot. Great build quality, more features than you'd expect for the price and a wide range of compatibility for the main smart home ecosystems.I'm using it with Apple Home via the SwitchBot Hub 2's Matter integration, so far, no performance issues.

Great contact sensor for the front door, works well with give assistant

Reliable, quick and easy to set up, decent price and great customer service.

These are the most reliable and battery efficient door sensors I have found.They are at first glance feature packed as they have multiple sensors built in. From the obvious door open and closed detection it also has built in... Ambient light level sensing, motion sensing (which when used in conjunction with the door open and closed sensor determines if you're vhave entered of left the room/building), temperature sensing and finally a button to trigger events or scenes.So what's the problem? Surely the reliability and all these features should get them a 5 star rating? Well yes they would... BUT...Most of these features aren't presented to other devices/frameworks such as Alexa or Smartthings. This means that the only features available to trigger an event or scene is the door open or closed sensor.This means it can't be used for launching a simple scenes such as turning the lights on when entering a room (and when it's dark) and off again when leaving the room.This is a major flaw and limitation. I'm can't say if this limitation can be overcome using something like IFTTT or Home Assistant.

Smart home systems can be clunky and difficult to use, but the SwitchBot ones are great. They work well straight out of the box. There is enough customisation available in the app so you can do what you want, without it being too technical and overly complicated. Would recommend.

Seriously well constructed piece of kit that combines multiple sensors in with a programmable switch. Really useful and far more than just a contact sensor

Smaller than my last door contact sensorWorks well with my old switchbot HubUsed with Alexa routines to switch lights on \ off with door opening on and off (approx 1-3 seconds wait time)Takes AAA batteriesVery happy with this product