The black inflatable butt plug has a smooth surface and is therefore easy to insert. After insertion, carefully use the hand pump to inflate the butt plug. The anal plug has multiple vibration speeds, which can be adjusted with the hand pump. There is a pressure relief button on the hand pump, the air exits the butt plug when you open it.Waterproof 3 AA Batteries Powerful vibration modes Made of Soft Silicone Ergonomic shape From 3.8 cm. up to a maximum of 8 cm. wideLength: 5 InchesWashing: Hot soapy water and toy cleanerInsertable: 1 to 5 inchesDiameter: 1.5 InchesColour: BlackFlexibility: FirmController: WiredFor Who: BothFeatures: Expandable to 8cmMaterial: SiliconeBrand: Various Toy BrandsPower: 3 x AAA (Included)Size: 5 Inches