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AutoAQUA Smart ATO Lite (SATO-280P) uses QST(Quick Security Technology) for real-time fail safe protection against any failure or mulfuction of water level situation. By simply placing the optical level sensor to the desired placement, you will be able to accurate monitor the water level of your tank. The smart ato duo controller will give both audible and visual alert when it senses unusal events, such as, the unsual change in the total water refilling time. For example, if the first refilling time is 10 sec, it will alert when any other refilling time is over 60 sec. *No security time control for the first refilling. QST can also detect the malfunction of the sensor, the controller, and the reservior tank. It can effectively prevent the pump and your tank running dry.