Extra Loud 105dB Alarm Sounds When Water In Basement Sump Crock Rises Above An Acceptable Level. Also Monitors For Flooding Anywhere In Your Home. Alarm Housing Can Be Kept Dry By Mounting On Wall Or Stud With Mounting Screws Provided. With The 6-Foot Sensor Wire The Water Detection Probe Suction Cup Can Be Mounted To Any Hard Surface Or Be Suspended To Desired Level In Sump Pump Crock With Weight Provided. Low Battery Signal. Requires 9-Volt Battery (Not Included).