3 AAA batteries (not included). You need to buy them after you have used them. They are available in small stores and supermarkets. You cannot use high-current batteries such as Nanfu, Duracell, and rechargeable batteries. Normal ones are fine.
Function
strong light-low light-flash-off
Scope of application
outdoor fishing, camping, night riding, maintenance, night emergency lighting, etc.
Color
blue, black, red, three colors (4800 single colors of other colors can be customized!)