Charging mode: USB direct charging Housing material: zinc alloy Use the battery: built-in 18650 lithium battery Switch type: tail press switch Product weight :240G Use time: about 4 hours continuously Product size: 15.3*2.8*4cm Packing list 1*Hair clipper 1*USB charging cable 3*limited comb ( 1mm / 2mm / 3mm ) 1*cutter head protective cover 1*cleaning brush/curing fluid