Meross Smart Door Window Sensor, Mini Contact Sensor for Security and Home Automation, WiFi Alarm System, Real-Time Alert, Works with HomeKit, Alexa, Google, SmartThings, Meross Hub Included Start Kit

I’ve used this door/window sensor in multiple locations and have been impressed with its overall reliability and performance—enough to purchase additional units. It pairs easily with the included hub and reports open/close states quickly and consistently. One of the standout features for me is how well it integrates with Google Home, which I actively use in my smart home setup. The setup was seamless, and it has worked reliably within the Google ecosystem. There is also integration with Alexa and Apple HomeKit, although I haven't personally used those platforms to confirm performance. The hub included with this sensor can be used with other products from the same brand, making it a great addition to a larger ecosystem of devices. However, it's worth considering the broader product lineup and how everything integrates before purchasing, especially if you plan to expand your setup. The hub can experience some interference from other nearby devices, which may occasionally affect communication stability. It’s a minor issue but something to keep in mind if you have many devices in your network. Battery life reporting has been inconsistent. During the winter months, one of my sensors sensor showed single-digit battery levels, but despite that, I haven’t changed the battery yet. Now, a couple of months later, the battery level is still around 50%. The fluctuations in reported battery life appear to be largely temperature-related, so I’m waiting for the sensor to stop working before replacing the battery. While it’s a bit unpredictable, the actual battery life has been good overall. Overall, it’s a solid and dependable sensor with great value, especially if you’re considering it as part of a broader smart home ecosystem.

I bought these as security devices for my windows, I thought it was either a broken device or my home (I live in an old building) causing problems, so I’ve bought a number of these devices, which I’ve since tested extensively. - They suffer with really poor signal, the device and the hub sit in the same room with no obstructions and still don’t work consistently, if at all. - Battery life is measured in weeks, not months or years as per the claim. - The communication can be instant or be delayed for several hours before a notification, which is utter crap for a security device. - No point talking about the build quality or instructions both being ok, if you can’t get the device to function properly since day one. Try and find a better product elsewhere. These guys make decent smart plugs and I wanted to try the sensors, with the expectation of using different types (humidity, damp, light, pir, etc.) but this has really put me off.

I bought the kit version which includes everything needed to get started, including the sensor, hub, and power supply. Installation was straightforward, guided by clear prompts in the Meross app. However, unlike some other Meross or competing smart home devices, the sensor was not automatically detected. I had to manually search for the product to begin setup, which added a small extra step. In all the setup took less than 5 minutes. The sensor functioned well throughout my home, even transmitting through a couple of thick walls. However, if the sensor is near the edge of the signal range, it may fail to send state changes, and it doesn't appear to retry. I'm not sure if this is a common limitation of similar devices. The app take 2-4 seconds to update, which is reasonable but it would be nice for it to update instantly locally. The sensor uses a CR2450 battery, but I would prefer it to use a pair of the more common AAA. They claim that the battery life is 2 years, but I can't confirm that yet. Replacing the battery is slightly challenging due to the tightly clipped case, but the downloadable manual provides clear instructions. The sensor can be used for automations within the Meross app, but you can also configure notification. I enabled the open for 1 minute notification so now I know if the back door has been left open. Sensor data looks like it's stored for several years and can be exported, but it's not clear why you would want this. Alexa integration was seamless. Just a simple click in the app, and the device appeared in the Alexa app, ready for use in routines and automations. I was able to ask Alexa "Is the back door open" and got the appropriate response about the device state. Final Thoughts: This contact sensor is a great addition to any smart home! It decently performant, has good coverage in my home, and easy integration with Alexa. While I do think there might be a small improvement to the app setup process, it’s definitely worth considering if you've already using other Meross devices or if you're looking to get started for a low-price.

Great product when it works. However, Sensor disconnects often and I have to switch it on and off for it to work again. Also, it does not alert you when it’s offline. Or disconnected.

The product stopped working within month of purchase