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Washlet (ウォシュレット Woshuretto?) is a registered trademark of the Japanese toilet company Toto, referring to electric toilet seats with water spray feature for washing. While it is commonplace at toilets in Japan, the term washlet may be used colloquially to refer to non-Toto seats with comparable features. The washing feature includes anal and genital cleansing. The buttons associated with operating these features are labeled "oshiri" (bottom) and "bidet". Some models have a sensor that prevents spraying water when a person is not sitting on the toilet. In order to determine the appropriate spray position, Toto surveyed 300 male and female employees during development.[citation needed]

Washlets offer several features, including electric seat heating. The product line with only the heating feature are called warmlets by Toto.

The Toto Washlet range of toilets and accessories include integrated bidet toilet seats, as well as add-on bidet seats for upgrading a standard toilet. The Toto Washlet S300 is one such seat. This seat features a heated seat, retractable cleaning wands, warm water massage, warm air drying, and a built in automatic deodorizer. A digital thermostat and an automatic opening and closing toilet seat are additional features.

The Washlet range also include a number of lower-priced models such as the Washlet C110.

The initial model Washlet G was certified as item No. 55 of Mechanical Engineering Heritage in 2012.