An easy-to-use erection pump even for a beginner, it is a simple penis pumping system that uses gentle suction to reach your hardest spot. The tube is made of a very strong and high quality transparent plastic, a perfect seal to ensure air vacuum. A graduated scale allows you to see the length increase in real time. Characteristics: Alexander erection pump with vibration Multifunctional thanks to its exquisite vibrations Material: TPR, PC and ABS Measurements: See photo Batteries: 2AA Perfect for beginners Quick pressure release systemPretty Love manufactures high quality products. They have a 1 year warranty on technical defects.