This Banana Pulsabath Vibrating Sponge is completely waterproof for a wet and wild washing experience! However, it can be used wet or dry. Its soft, porous texture easily absorbs soap and lotion, leaving your skin silky-smooth and refreshingly clean. Adjust the twist-top speed control until you reach your desired vibration intensity and enjoy a thrilling, relaxing massage while you bathe. Overall length is 8¬¨?’ and requires 2 AA size batteries, not included. Rub-a-dub-dub‚ Use it in the tub!