The new "bass vibration" product, which is small but easy to hold and high-powered, has finally arrived! The large size and thick silicone rotor makes it possible to realize "heavy bass vibration" that resonates heavily inward and outward! Big size x High power x Silicon = "Bass Vibration" You will immediately feel the power beyond your imagination! The big size and long size DUO (duet) specification gives you an even deeper reach with the 100mm size rotor that you cannot experience with SOLO. 10 various vibration patterns are equipped! And don't forget the stylish form! And by using special silicone for the exterior of the vibrating part to match the form, we've achieved an unprecedented sense of luxury and gentle feel! And of course, it's waterproof, so it can be washed with water for easy maintenance! Uses 2 AAA batteries