Instructions for use of high-intensity flashlights: I. Instructions for use of switches 1. The positive pole of the battery faces inward (on the lamp head side) and the negative pole faces outward (at the tail). 2. The switch is at the tail. The switch function is the switch function, and the light switch is the dimming function. II. Instructions for use of circuit boards 1. This flashlight adopts advanced voltage-stabilizing and constant-current technology, which can effectively solve the requirements of LED flashlights for voltage-stabilizing and constant-current. 2. Special tips: a. Do not use overvoltage, and the voltage should not exceed 4.2V b. The positive root of the battery faces forward, do not reverse it, otherwise it will burn the board c. Pay attention to controlling the temperature change of the flashlight to ensure heat dissipation d. Non-professionals should not open the circuit board III. Instructions for use of lithium batteries 1. The flashlight battery mainly uses 18650 and 16340 lithium batteries. 2. Characteristics of lithium batteries: The charging method of lithium batteries is completely different from that of mobile phone batteries; lithium batteries have no memory and can be charged at any time, do not overcharge or over-discharge. 3. The first charge takes at least 6 hours, and then it can be charged according to the green light of the charger. 4. When not in use, the natural discharge rate of lithium batteries will release about 1% or less of its charge every day. Although it is slow, it should be prevented from being placed for too long. 5. Pay attention to the battery's waterproof, anti-expiration, and anti-fall properties. 6. Special reminder to use a "three-proof" charger that is anti-overcharge, anti-reverse connection, and anti-short circuit; 7. If the battery is not used for a long time, it should be fully charged and stored, and normally charged and discharged once every three months; IV. Instructions for use of flashlights 1. When using a flashlight, choose it according to the flashlight's requirements for voltage and battery. Do not use it indiscriminately to prevent burning the circuit board. Do not use batteries of different models and voltages at the same time. 2. During use, turn off the flashlight when the brightness of the flashlight changes significantly to prevent over-discharge of the battery. 3. Heat dissipation tips: When using the flashlight, ensure heat dissipation. It is strongly required to use the second gear when the battery is fully charged, so that the flashlight head and battery can extend the product life! Holding the flashlight tightly with your hands is the best way to dissipate heat. It is recommended to dissipate heat or turn it off in time according to the heat of the flashlight when it is lit, and then light it up after the temperature drops to dissipate heat. 4. Strengthen precautions against the flashlight's instructions on waterproofing and shockproofing. 5. Keep the inner wall of the lamp cup clean and do not wipe it with your hands or hard objects; to clean fingerprints on the lens, you can use a cotton swab dipped in lens cleaner to gently wipe it. 6. Do not shine the flashlight directly into people's eyes to avoid affecting vision, especially children. 7. If you do not use the flashlight for a long time, please remove the battery (one month or longer) to avoid chemical corrosion. V. Protection Instructions 1. Do not expose the flashlight to sunlight, water, chemicals, corrosive gases, etc. for a long time to avoid damaging the flashlight's protective layer. 2. To keep the "0" ring and thread rotating smoothly, apply Vaseline oil on their surface 2-3 times a year. VI. Troubleshooting 1. Check the battery: make sure the battery is charged and installed in the correct direction. Do not use batteries of different brands, and do not mix old and new batteries. 2. Check the tail cover: make sure the switch is tightened and in good contact, and ensure that the copper column of the tail cover and the metal sheet of the tail cover pressure ring are in good contact. 3. Pay attention to whether the lamp head is loose.