Exclusive touch-sensitive Temperature Sensor System, increases vibration intensity when body heat is detected during use. Subtle raised stimulating band around shaft. Quiet 3-motor system, choice of 10 vibration levels activated via push-button. Measuring 8.5 in. by 1.25 in., the Yuzu is constructed of top quality, odorless, body friendly silicone. Lightweight. splash-proof and rechargeable via USB connection or A/C power supply. The heavy duty Li-ion battery allows for up to 3 hours between charges.