The best sump pump alarms are standalone high-water warning systems featuring a dedicated battery backup (such as a 9V battery or rechargeable pack), a loud 85-decibel siren, and a separate mechanical float sensor that operates independently of the primary pump's electrical circuit. Advanced smart models also feature Wi-Fi connectivity to send immediate push notifications or text alerts to your smartphone if water levels rise while you are away from home. Verification: Test the battery backup and siren volume monthly using the unit's manual test button.
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