1) Battery: 3x AAA(1.5v) batteries 2)High strength corrosion 3)Resistant aircraft grade aluminium construction 4)Durable anodized 5)very low cost per hour of operation 6)water resistant and shorcproof 7)reliable switch with constant and momentary function 8)LED lifetime:100000hours Packing: 1)inner packing:1 pc/BLISTER size:12*5*22.5cm 2)outer packing:120pcs/carton size:69*44*48cm