Not that reliable..
I got this for my acupuncture practice and it's not that reliable. The sound is pretty loud, although it hasn't gone off several times when patients push it. It has worked many times, just not as reliable as I need it to be. I kept the base unit outside the door so I could hear it anywhere in my clinic and it would be close to my patient. Too bad, there really is a need for something like this.
Rating: 2 stars