Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works sporadically and has no range

I read the description and thought this would be perfect for our needs. After setting it up, it didn't sound off for any movement. After several tries it worked twice, but then stopped again. I was only a few feet away. I tried at further distances and it still only worked in 2% of the tests. Tried different locations, with clear line of vision and also without, but it still failed to work properly. I kept trying for a few days and no good. It is pretty rare I receive an item that is this bad, but it happened with this thing. This product is not even worth $0 (free). I would rather pay $100 on something that works.