This is a Jessa, a network massage device used for muscle and nerve pain.

As I get older, I haven't become a grandmother yet, but I experience abnormal signals in my nervous system, so I use a massager. I tried a body-attached electrical device, but it didn't suit me, so I removed it. I've tried many products. The JeSpa and network products are good. JeSpa has four functions with ten levels. I originally bought one, but it caused pain.I bought two more because the part is wide. The Jespa also charges electrically and emits high-frequency waves. You press the top part firmly with your hand, attach it where it hurts, and it suctions onto the skin. The difference from other high-frequency products is that other products attach a sticky silicone-like material to the body, but this product suctions on, so it fits perfectly. Since products with silicone pads are not cheap to replace, I prefer the suction type ^^