Exclusive Sound Response System increases vibration intensity as ambient sound or music is detected by a built-in sensor during use. Constructed of odorless, body-friendly silicone. Luxurious seamless finish on shaft and clit-stimulator. Quiet 2-motor system: 1 in shaft tip and 1 in the clit-stim. 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. Measures 9.5 in. by 1.75 in.