Doctor Air Body Cushion This is a massage device for your lower back, buttocks, etc. I have confirmed that it is in perfect working order. It charges via USB-C and is simple to use, with an on/off switch and vibration that starts when you apply your weight. The strength cannot be adjusted. You need to apply a fair amount of weight, and it only activates when you put your weight on it with your lower back or buttocks. I couldn't use it effectively and have only used it a few times. Therefore, I think it's in relatively good condition, but please understand that it is a used item before purchasing. Please note that the charging cable is not originally included, and everything in the photos is what you will receive. Also, the zipper on the main body cover did not originally have a pull tab, so please be aware of that.