Rechargeable ring with nubby texture for enhanced sensation. 10 turbo charged speeds of rumbling vibration. Body-safe Silicone and waterproof submersible - IPX7. USB rechargeable - magnetic charging cord included. State-of-the-art memory chip resumes on last speed used. Security travel lock feature - hold for 3 seconds to turn on or off. Complete charge in 1.25 hours. Runs for 35 minutes on high speed and 45 minutes on low speed. 3.75 in x 2 in/9.5 cm x 5 cm (enhancer)