Our most popular alarm is the Basement Watchdog Sump Pump Water Alarm, model BWD-HWA. It will sound a 110 decibel alarm when water reaches it's sensor. Another popular choice is the Reliance Controls Freeze/Flood/Power Failure Monitoring System & Dialer, model THP201. In addition to sounding an alarm when it senses a power outage, freezing temperatures in your residence and/or flooding, it will also dial up to 3 phone numbers to alert you of these conditions. The last option that is also recommended is the PumpGuard Sump Pump Protection System, model PUMPGUARD which will sound an alarm AND override your float switch to get you pump running in the event your switch fails for any reason, as long as you have electric (AC) power.