ltem description from the seller
Product number: S21
Product size: 20.4*8*20.5CM
Packaging size: 20.5*8*20.5CM
Outer box size: 84*42.5*42.5CM
Whole Box Gross Weight: 17KG
Single piece weight: 0.4KG
Packing quantity: 40
Battery capacity: 800 mAh
Certificate: Appearance Patent, Quality Inspection Report