Exclusive sound-sensitive Sound Response System, increases vibration intensity as ambient sound or music is detected by a built-in sensor during use. The Nobu is constructed of top quality, odorless, body friendly silicone with a luxuriously soft, silky, seamless finish on the g-spot shaft and clitoral-stem. A quiet 2-motor system features one in the shaft tip and one in the clitoral-stem. You have the choice of 10 vibration levels activated via push-button. Splash-proof and rechargeable via USB connection or AC power supply. The heavy duty Li-ion battery allows for up to 3 hours between charges.