Kohler’s San Souci touchless flush toilet uses a sensor mounted on the inside of the tank that sets off the flush when a hand is waved over it. It features a one-piece design, a compact elongated bowl, a Comfort Height seat, a concealed trapway and low-profile bolt caps. With its 1.28-gpf output, the WaterSense model is eligible for consumer rebates in some municipalities. The AquaPiston flush engine directs water to flow in from all sides, and the precision-engineered tank, bowl and trapway create a strong siphon. The sensor is powered by four AA batteries which will last more than six months. The toilet is available in 10 colors.