Note:The product does not include power banks.You need to use 5V.2A 20000Ah or more power bank.How to UsePress and hold the power button for three seconds then you can use it, please note that you need to use the power bank when you use it.Cloth Size:We are Asian size, 2-3 sizes smaller than European size.Please choose the correct size according to our size chart and height/weight recommend.EU Size XS=Asian size MEU Size S = Asian Size LEU Size M = Asian Size XLEU Size L = Asian Size 2XLEU Size XL = Asian Size 3XLEU Size XXL=Asian Size 4XLPlease choose the right size according to your body shape_x000D_