⚡【Purchase Notes】Can use 4 xAA batteries or DC 6V power adapter (both are not included), But after repeated trials by the seller, the machine works 350 times per minute when using the battery. The faster the working frequency means the denser the sewing thread and the stronger the sewn clothes.Note: Because it is a monofilament sewing machine, you need to tie it yourself, otherwise the cord is easy to fall off.