High vacuum electric pump. 3 sleeve sizes for a snug fit. Extra large chamber. Waterproof. Phthalates free. Materials: silicone, AS, ABS, PVC. Pump size: Length - 13.375?, Diameter - 2.75?, Circumference - 8.75?. Three sleeve sizes: (internal diameter of opening), Small - 1.125?, Medium - 1.375?, Large - 1.5?. USB Rechargeable Charging time: Up to 1 hr. Use time: 1 hr.