Royal One vibrating cock ring with free Satisfyer Connect App that allows you to createvibration programs, exchange ideas with other users or control toys from all over the world via the Internet and much more! It can also be controlled without the app using the intuitive One Button control panel. Made of soft medical andphthalate-free silicone, waterproof and rechargeable via USB cable.Outer diameter: approx. 5 cm; inner diameter: approx. 3 cm.