[Product material]: Breathable cotton, plastic is polypropylene. The fabric has good elasticity and does not deform Velcro design, the Velcro design on the wrist can be freely adjusted in size, tightness and height fit High-brightness lamp beads Concentrate high-transparency, high-quality high-brightness LED lamp beads, strong and transparent light-gathering performance, easy to deal with, various work and entertainment scenes at night Comfortable and breathable fabric has good air permeability, effectively keeping hands dry, high-quality high-elastic fabric fits hands, making movement free and capable Replaceable battery, (the design of the large machine box can accommodate two AAA batteries (this product does not come with a battery)