Maximize your pleasure tool in and out of the water with the Optimum Series Rechargeable Waterproof Pump, a sleek, durable penis pump made for superior suction and performance enhancement. Increase endurance, improve stamina and amplify your rod with 3 speeds of suction and a fully automatic pump experience. The sleek smart pump has easy-touch controls and a quick air release button for easy pumping. A soft, comfortable Silicone donut base creates a tight seal for superior suction and a plush pumping experience. Never settle for less when it comes to the size of your pleasure with the Optimum Series. The cylindrical pump and thick, durable sleeve are designed to create the perfect seal and powerful suction at the touch of a button. Once you've reached your peak pump, use the quick air release to decrease suction or release seal. When used regularly, this powerful pumper can increase stamina, enhance overall size and amplify sensation. Recharge the premium pump in 2.5 hours with the provided USB charging cable to enjoy 160 minutes of high-speed stimulation or 180 minutes of low speed suction. To track progress, use the incremental measurement marks on the cylinder shaft. The premium sleeve fits into most standard pumps, but can be used independently for a passionate stroking experience.