Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not Dependable

The first one was defective. The company sent me another, which worked for a while. Yesterday, it completely died. Putting new batteries in the sensor did nothing (it eats batteries like crazy, even though I only use it at night to detect when my husband with Alzheimer's leaves his room). I plugged in the AC converter and nothing happened, so it's going in the trash! I'm looking for a replacement.