The main part of the LED flashlight consists of the following parts:

1) Power supply (dry battery, accumulator, lithium battery, etc.);

2) Circuit board (LED drive circuit);

3) LED lamp head;

4) Light collector (reflector);

5) Gear switch;

6) Torch shell (battery cover, barrel body, barrel head with light-transmitting lens);

7) Other accessories.

The main categories of LED flashlights are:

1) The light intensity can be adjusted. Through the same button, the light can be controlled into strong light, low light and flickering;

2) Various forms of power supply, including No. 5 AA batteries, No. 7 AAA batteries, rechargeable batteries, and manual charging;

3) Various grades of light intensity, which are realized by voltage, and the voltage range is generally 0.8 volts - 3.7 volts;

4) There are waterproof and non-waterproof types;

5) A variety of shapes, including portable and hand-held, can also be divided into right-angle, straight, and head movement;

6) According to the use, it can be divided into security, mining flashlight, ordinary flashlight;

7) Including other auxiliary functions, such as charging mobile phones, etc., with a knife, imitation pen;

8) According to the effect of heat dissipation, it can be divided into aluminum alloy shell, stainless steel shell, iron shell, plastic shell, etc. Of course, if the heat dissipation is good, the light decay will be much smaller.