Just slip in your cock, set the Turbo Stroker and hold on for huge orgasms! Fully automated 5 1/2" deep stroker uses a built-in silicone sleeve to milk your shaft with 3 speeds of stroking and 3 speeds of vibration! Or warm up first by enveloping your erection with 3 speeds of vibrations –– like a "hummer job." You can also use BOTH the stroke speeds and vibrator speeds at the same time for a wild hummer! The silicone material easily accommodates up to 5 1/2" of what you've got. The opening is 2 1/2" inches wide. Be sure to add water based sex lube to your Waterproof Turbo Stroker for the best orgasmic experience.