With the press of a button, you'll experience mind-blowing suction that helps increase your stamina, enhance your overall size and amplify your sensations. Once you've reached your peak, use the quick air release to decrease suction and release the vacuum seal. You can see your results through the clear cylinder that has incremental lines to measure your progress. Enhance your pleasure by using the ultra-soft silicone ring that helps maintain and strengthen your erection. USB rechargeable. ABS and silicone. 11 3/4"L" x 3 1/3"Dia. This item is non-returnable. You must be 21 years or older to order Sexual Aids.