envy six7 Functions with incremental speed control. Independent incremental speed control. Complete charge in 2.5 hours. Premium Silicone maintains and retains body heat. Unscented non-porous hypoallergenic. Satin finish and virtually seamless. Whisper quiet. Instant on and off button. State-of-the-art memory chip resumes on last function used. Security travel lock. Premium rechargeable lithium ion battery. LED indicator light.