Very good product, definitely value for money, easy to install and easy to connect with Alexa. The sensor sends you notifications when the door opens or closes or wherever else you have placed it. You can also remotely ask Alexa through your mobile if, for example, the door is open and Alexa will answer you. For 15 euros, it is worth it and more. I give it 4 stars and not 5 only because the packaging comes with batteries but they didn't work for me, so I had to buy new ones

Very good purchase and one of the few that work independently without a hub. It connects quite easily with the Simple Home app but also with Alexa, where one can create various scenes depending on the peripherals it has (e.g. when the door opens, turn on the lights). You can also receive notifications on your mobile every time the door opens or closes. The quality seems okay and the packaging was decent, as it came with its own batteries (2xAA) and everything I needed was in the package. The adhesive tapes could be a little better, but I hope they hold up. It gave me a little trouble at the beginning until I activated it, but overall it does exactly what I wanted.