Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sonin 700 Water Alarm - failed in first month

I purchased the Sonin 700 last month. Before I started using the unit, I tested it and it correctly sounded the siren. This month I tested it again and the siren now emits a weak and useless clicking sound (even after replacing the battery). My take - beware the Sonin 700 is 'false security'.