Optimum Series Rechargeable Advanced Automatic Smart PumpFEATURES: Sleek and durable automatic pump with superior suction at the push of a button Fully customizable exercise modes set your desired pressure and duration for up to a 20 minute workout or set to manual pumping Easy to read LCD screen that includes battery life indicator, pressure, mode and workout time Ridged stroker sleeve is removable for independent use and is designed to fit most pump cylinders Ultra thick chamber sleeve for magnified