The AutoAqua Smart Temp Security protects your tank from a malfunctioning heater or chiller by cutting power the moment temperature drifts outside a safe range — a plug-and-play safeguard against equipment failure rather than a replacement for your primary heater/chiller controller. Sensor: compact, easy-to-clean temperature probe designed for saltwater aquariums, magnetically mounted for tool-free placement anywhere in the tank Function: cuts power to a connected heater or chiller if temperature moves outside the safe range, with audible and visual alarms Safety: auto time delay prevents false alarms during power outages Specs: 100-240VAC input/output, 10A, max power 1100W (110VAC) / 2200W (220VAC); max mounting thickness 1/2in; temperature security range 72-84°F (22.2-28.8°C) ±0.5°F; 10ft cable Includes: Smart Temp Security device with world plug adapter.Setup is plug-and-play: plug your heater or chiller into the Smart AC Switch, place the sensor in the tank, and it's active — no app or programming required, just a hard cutoff if temperature runs away.