Maximize your pleasure tool with the Optimum(TM) Series Advanced Automatic Smart Pump, a sleek, durable penis pump made for superior suction and performance enhancement. Increase endurance, improve stamina and amplify your rod with this plethora of customizable exercise modes. Use the easy-touch buttons and LED screen to enjoy manual pumping or set pressure and duration for up to a 20-minute workout. The sleek smart pump has easy-touch controls and a quick air release button for customizable pumping. While the thick open-end sleeve and tight, nubbed chamber give you sinful stroking pleasure with or without the pump. 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 hours with the provided USB charging cable to enjoy 12 hours of pumping pleasure. To track progress, use the incremental measurement marks on the cylinder shaft. Materials Polystyrene, ABS Plastic / Metallic Plating, Thermoplastic Elastomer, Thermoplastic Rubber Power Source USB Rechargeable (Included) Max Run Time 720 minutes Max Charging Time 120 minutes Measurements 8" x 2.5" / 20.25cm x 6.25cm (Cylinder) 5.25" x 3" / 13.25cm x 7.5cm (Sleeve)