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Velleman MK134 Steam Engine Sound Generator Kit Category_Standard Bits Dual material handle has MoldedGeneral Information Manufacturer Velleman Part Number MK134 Product Type Electronic DIY Kit Miscellaneous Skill Level Rookie Required Skills Soldering Batteries 1 9V Battery Required. Not Included Features Generates the sound of a steam engine, with adjustable speed and volume. Push the on board button for a steam whistle effect. Electronic kit, assembly required Dimensions: 3. 9 x 3. 3" Item Weight 4 ounces