Product Features: - High vacuum electric pump - 3 sleeve sizes for a snug fit - Extra large chamber - Waterproof - Phthalates free - RoHS compliant - 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" - Voltage - 3.2V - Rechargeable - Charging time: Up to 1 hr. - Use time: 1 hr.