Using the Calexotics Apollo Hydro High - Intensity Waterproof Vibrating Stroker is easy. First, insert 4 AA batteries into the device. Then, you can attach the sleeve. You can use the push - button control to select from 30 vibration levels. The suction cup base and swivel mount allow you to set it up in different positions for hands - free pleasure. Since it's waterproof, you can use it in the bath or shower. After use, simply remove the sleeve and wash it with mild soap and water. Let it dry completely before reattaching. Keep the device in a cool, dry place. Also, make sure to replace the batteries when the vibration becomes weak. Enjoy your time with this amazing stroker and always use it according to your comfort.