Little bit touchy. Does not recognize each and every close.

Set up was easy with a current eufy homebase, works as expected!

These sensors are small, reliable, easy to set up, and look nice and modern. Just put the battery in, spend 30 seconds pairing with the Homebase and assigning it a name, then stick the two parts on your door/window and frame. It's a nice way to supplement a couple of Eufy cams since the cams' motion/human detection is maybe 90% reliable. Be sure to use the Eufy app to customize when you want to receive notifications and alarms. I have mine set so they don't send any notifications when our system is in Home mode, but will alarm when in Away mode. If you have a lot of sensors or modes, it's annoying to configure the settings one-by-one in the app, but you'll probably only do that once or twice anyway. The adhesive backing is very strong, so make sure of where you want to place them, then position carefully. I'm sure they'll pull up the paint when I want to remove them, so if you're worried about that, maybe attach them to Command strips first. (Just remember that if the adhesive is too weak and they fall down, your alarm might go off.) I haven't owned them long enough to comment on battery life, but the rest of the process is incredibly straightforward, and I think these are a good deal when they're on sale.

This is an excellent addition to our eufy security system! It works exactly how it should. We have it on our front door/slider doors in kitchen and master bedroom. I have it set so if the door is opened during the night or whilst we are not home the home base triggers a loud alarm and also alerts us via our phones. You can select a handful of notification noises when the door is opened. The sound comes from the home base and you will receive a notification on your phone. I haven't had any issues yet.

Batteries last forever! This sensor helps me ensure all doors are closed or at least know when they’ve been opened. Easy to pair with my Eufy security system.