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, 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. Available in 10 colors.