The AutoAqua Smart Level Security protects any pump-fed equipment from running dry or overflowing by monitoring water level with an optical sensor and cutting power via a plug-and-play AC switch — it doesn't pump or add water itself, it simply shuts equipment off before a level problem becomes a flood or a burned-out pump. Sensor: optical, no moving parts to fail, magnetically mounts to clear, tinted, or painted surfaces in seconds Modes: works as either a high-level or low-level cutoff sensor depending on where you mount it and what you're protecting Function: automatically shuts off connected equipment and triggers audible/visual alarms on a level fault Safety: auto time delay prevents false alarms from temporary fluctuations or power outages Specs: 100-240VAC input/output, 10A, max power 1100W (110VAC) / 2200W (220VAC); max mounting thickness 1/2in; 10ft cable Includes: Smart Level Security device.Use it as a high-level cutoff to protect against sump overflow, or as a low-level cutoff to shut off a return pump before it runs dry — plug your pump into the included AC switch, mount the sensor, and it's active immediately.