Regarding Heat: The product generates a significant amount of heat during operation. This is normal; the built-in temperature control system will not damage the product. When using the high-brightness setting, it is recommended to take precautions against burns. When using the flashlight: Check that the front and back of the flashlight are securely tightened. Battery Usage: Position the positive (+) terminal of the battery towards the head of the flashlight and the negative (-) terminal towards the tail switch. Important Notes: Do not over-discharge the battery. Over-discharging will prevent the battery from charging or render it unusable. Maintain a certain voltage during charging and discharging. Even when not in use, charge the battery periodically (once a month if not in use) to prevent voltage drop. Storage Requirements for Cylindrical Lithium-ion Cells: Store the batteries in a clean, dry, cool, well-ventilated room away from flammable materials and corrosive substances. Keep the batteries away from fire and heat sources, avoid direct sunlight and rain, and do not invert or subject them to heavy pressure. Regarding battery life: The total time from activation at a certain brightness level until it completely shuts off, following the overheating adjustment. Regarding illumination distance: The indicated illumination distances are measured using laboratory instruments, not estimated by the naked eye. They differ from human perception. Factors such as battery level and atmospheric quality will affect the actual illumination distance during use. Note: Do not shine the light directly into your eyes. In high brightness mode, the light heats up very quickly; please be aware of the heat. The heat is particularly noticeable in poorly ventilated indoor environments. Color:Black Material:Plastic+Metal Packa