The Saniflo Sanialarm alerts you when the volume of water exceeds the maximum level allowed on Saniflo pumps. Battery-operated unit is easily fitted onto the lid of the pump and features a level pressure switch that triggers an alarm that emits a continuous 80 dB warning sound until the unit is switched off or the problem is corrected. Can be installed on most Saniflo pumps on new or existing installations including Saniplus, Sanibest, Sanigrind, Sanipack, and Sanivite. Will not fit the Saniaccess3. Uses AA batteries (not included).