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It consists of a hollow saddle -like seat containing two electric motors , motor speed controller boards, gearing, pulleys and a platform on cranked axles such that a ridge on the top of the unit can be made to vibrate through a range of speeds as set using a wired external hand controller, and an upward pointing shaft set on an angle through the ridge can be made to rotate at speeds from zero rpm to several hundred rpm, again by use of the wired remote control. Flexible moulded attachments are supplied which fit over the vibrating ridge and shaft which mostly have integrated dildos on their top. In use, the rider locates the dildo into their body cavity for internal stimulation while pressing their external erogenous parts on the vibrating ridge. According to its inventor Dave Lampert, the Sybian was first conceived in the s, and developed in A prototype was built in from sheet metal mounted on a wooden frame with a vibrator projecting through an opening inside the housing; a second prototype became the basis for current production models.