Instruct: Classify a review as either positive or negative.
Query: excellent product

I must preface this by saying I only use these alarms inside my house. As a single woman with a limited income, these are the best security (besides my German Shepard) devices I could ever buy. I have 2 Driveway Patrols in my house and have had them several years. It is easy to hang them on a wall (by the front and back doors, high enough that pets can walk by and the alarm does not go off) but low enough to detect a person. I only turn them on at night. They work perfectly, I have never had one problem with either. They help me sleep much better at night!