The TOTO T40 WASHLET+ Legato One-Piece Elongated 1.28 GPF Toilet and Contemporary WASHLET S550e Bidet Seat is designed to conceal the WASHLET+ power cord and water supply hose for a seamless installation. The WASHLET S550e features TOTO's technologically advanced EWATER+ system which uses electrolyzed water generated by a technologically advanced process, transforming the water into a safe and powerful compound. By misting the bowl after every use, the EWATER+ technology helps to keep your toilet bowl clean and hygienic without any extra harsh chemicals. The PREMIST function sprays the bowl before each use to prevent waste buildup, keeping the bowl clean. The TOTO WASHLET S550e is operated by a luxury style illuminated touch pad remote with 2 user memory to save preferred settings. The WASHLET features 5 spray settings, auto open and close lid, heated seat, a nightlight, and instantaneous water heating. The newly redesigned lid style resides flush with the toilet bowl, providing a streamline look and giving the impression of an integrated system. The minimalistic display provides a more subdued appearance to your WASHLET. Skirted Design toilets also minimize the need to reach behind the bowl to clean the nooks and crannies of the exterior trapway. The Legato features TORNADO FLUSH , a hole-free rim design with dual-nozzles that creates a centrifugal washing action that assists in rinsing the bowl more efficiently. This version of the TOTO Legato includes CEFIONTECT, a layer of exceptionally smooth glaze that prevents particles from adhering to the ceramic. CEFIONTECT, EWATER+, and TORNADO FLUSH create a synergy that optimizes performance to reduce the frequency of toilet cleanings, minimizing the usage of water, harsh chemicals, and time required for cleaning. The Legato comes ready for install into a 12" rough-in, but may be adapted for a 10" or 14" rough-in with the purchase of a separately sold adapter. Additional items needed for installation must be purchased separately: wax ring, toilet mounting bolts, and toilet water supply lines. Compatible with T40 WASHLET+ electronic bidet seat and toilet bowl components only.