TWINBIRD Head Spa, Waterproof, Cordless, Rechargeable, Made in Japan, Co-developed by Yukie Yamamoto, Pearl White, TB-G001JPPW

This cordless, rechargeable device can be used anywhere. It features 60 rotations per minute in LOW mode and 75 rotations per minute in HIGH mode. It's waterproof (JIS IPX7 equivalent), so it can be used anywhere, including the living room or bathroom, and can be washed thoroughly. The included waterproof "guide sheet" introduces six different settings to suit your fatigue and concerns.