1. heads, medium. Household generally not more than 12, the use of batteries in the 2~3 section is good, and then a little larger waste, for other special needs, according to the needs of their own to determine.

2. welding should be firm. Each diode is connected by welding on the circuit board, if the weld contact is not good, it may cause the bulb does not light or affect the whole service.

3. bulb surface to focus the spotlight. This flashlight unlike ordinary flashlight, you can adjust the focal length, attention should be paid when buying without astigmatism.

4. power switch contact should be obvious. This kind of flashlight adopts rotary switch more often. When it is tightened, it will open and loosen again. If the contact is not obvious, it is easy to cause the phenomenon when the light is out.

5. pay attention to waterproof. Because the utility model belongs to an electronic product, a circuit board is arranged at the front part of the flashlight, and the short circuit can cause short circuit damage.