The Deluxe Trigger Pump from Size Matters promotes lengthening, thickening, stamina, and increased orgasms all in one! This pump also features a unique trigger mechanism for better control which creates a vacuum in the sleeve: as you pump the pressure expands the blood vessels by increasing blood flow. A built-in pressure gauge lets you monitor the intensity. A flexible hose attaches the pump to the thick plastic cylinder that is shaped to fit comfortably and accommodate most sizes.