Work well. Wish the battery covers were screw on though. One keeps un clipping when we use the sliding glass door. Tried mounting it various ways but still bumps off as the door seats itself. Honestly may just epoxy the battery cover closed and just buy a new sensor if the battery ever dies. They work well though and are easy to set up. Good magnetic switches. Get about 1/2” -3/4” of play between sensor and magnet. Makes install easy.