State of the art memory chip resumes on last function used. Easy push button USB rechargeable. Charging cord included. Complete charge in 2.5 hours. Runs 40 minutes on high speed and 2.5 hours on low speed. Waterproof vibrations. Size 8.5 inches in total length, 5 inches insertion length. Made using Silicone, ABS Plastic. Travel lock for security. 1 year warranty.