one. Instructions for use of the circuit board 1. Our flashlight adopts advanced voltage stabilization and constant current technology, which can effectively solve the requirements of LED torches for voltage stabilization and constant current. 2. Special reminder: a. Do not use overvoltage, the voltage should not exceed 4.2V b. The positive root of the battery faces forward, do not reverse, otherwise it will burn the c board. Pay attention to control the temperature change of the torch to ensure heat dissipation D. Non-professionals Do not open the circuit board two. Instructions for using the torch 1. When the flashlight is used, choose according to the flashlight requirements on voltage and battery. Do not use it indiscriminately to prevent the circuit board from being burned. Do not use batteries of different types and voltages at the same time. 2. In use, when the brightness of the flashlight changes significantly, turn off the flashlight to avoid over-discharging the battery. 3. Heat dissipation skills: When using the torch, it is necessary to ensure heat dissipation. It is strongly necessary that when the battery is fully charged, it is better to use the second gear first, which can extend the life of the lamp and the battery! Do not direct the flashlight light into people's eyes, it is super bright and dazzling, so as not to affect eyesight, especially for children.