Focusing flashlight is also called zoom flashlight. The principle is to adjust the distance between the convex lens and the lamp bead to achieve concentrating and flooding. The focusing mode mainly includes rotary focusing and telescopic focusing, such as the excellent KT01 (rotary focusing). WY502 (flexible focus) and so on. Because it combines concentrating and flooding, it can be widely used indoors and outdoors, such as hiking, camping, night riding, home, mountain climbing, night fishing and so on.