Delta’s FlushIQ toilets offer peace of mind with overflow protection, touch-free flush and leak detection. Three key innovations in one smart toilet include: overflow protection, leak detection and touch-free flush. A sensor on the back of the bowl monitors the water level and if the level rises to a critical point, the sensor will prevent additional flushes. A built-in sensor identifies possible tank leaks and if the water level drops and breaks contact with the sensor, the LED indicator will change to solid yellow the next time the toilet is flushed. Simply wave a hand in front of the sensor on the tank to flush.