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Professional Stamina Trainer. Vibrating Penis Strength Exerciser with adjustable buckle, fit for all sizes. The trainer comes with 12 vibration modes, each one vibrates in a unique pattern allowing you to provide his penis with different training intensities and sensations. This fully waterproof penis vibrator not only allows you to give him sexual pleasure in the room, but also allows him to enjoy the immersible fun in the bathtub, providing him with a vibe where you can release his sexual desire anytime, anywhere. Its flexible design is suitable for most penis sizes. Made from high-quality silicone, which is soft and smooth to the touch, ensuring a more comfortable sexual experience.