Thank you for viewing! I purchased this on Amazon and used it about twice, but it didn't suit me, so I'm selling it. 【Wide Area Stimulation & Heater Function】Four massage balls and two arms firmly grasp the neck and shoulders. The three-dimensional movement of the massage balls and the up-and-down movement of the arms combine to provide a variety of massage techniques, stimulating a wide area from the neck to the shoulder blades at once, relieving muscle stiffness. In addition, a heater is placed along the neck, allowing for gentle stimulation while warming. 【Hands-free Use】The neck-hanging type allows you to use it while doing other things, such as looking at your smartphone or doing light work. When using it on your lower back, you have to hold it, so I use it by sitting in a chair and placing it between the chair and my lower back. Please purchase only if you understand that this item has been stored at home! If you have any other questions, please feel free to comment ♪