1. Head moderate number. Household generally not more than 12, use the battery in the 2 to 3 as well, and then a big bit of a waste for other special needs can be determined according to their own needs.
2. welding to prison. Each diode is connected to the circuit board by welding, Weld if contact is not good, it may cause bulb does not light or affect the overall use.
3. bulb condenser surface as possible on one point. This flashlight ordinary flashlight can not adjust the focus, the purchase should be careful not to have astigmatism.
4. Power switch contact significantly. This flashlight use of a rotary switch, and tighten it open, then loosen it off, if the contact is not obvious, when it is easy to cause blinking phenomenon.
5. Note waterproof. Because it is electronic products, flashlight front of a piece of circuit board, once the water prone to short circuit, causing damage.