●High Capacity Battery and Strong Vibration: 20 vibration patterns and 8 vibration speeds, so you can choose the one that suits your preference. Built-in 1,400 mAh high-capacity battery that can be used for 4 hours. The mail order comes with a built-in 300 mAh battery that can be used continuously for one hour ●Silicone 360° Head: Made of flexible silicone material that is comfortable to the touch, non-toxic and odorless. Updated design appearance and product texture. With its 360° bend head, you can easily relieve pain from stiff shoulders and back muscles. It is an affordable and high performance product that makes it a great gift for friends and family ●Waterproof and Silent Design: IPX7 waterproof, so you dont have to worry about water intrusion, it can be washed and used easily in bathrooms, etc. Quiet design, excellent silence, and maximum noise level of 45 dB, so it wont disturb others and can be used safely at any time ●Cordless & Portable: USB charged, so you dont have to worry about messy cords. Compact and lightweight, easy to put in your bag, very convenient to carry ●(Quality Assurance): Comes with a Japanese instruction manual (English language not guaranteed) If there are any problems with the product, please feel free to contact us