Flashlight Strong Light Multi-function LED Glare Flashlight Zoom Torch USB Charging Portable Lamp For Outdoor Camping Craftsmanship ensures quality, exceptional portability, and sleek design Advanced technology delivers powerful illumination with high-performance LED Eagle-eye focus with telescopic zoom, compact and easy to carry Equipped with high-capacity lithium battery for extended lighting time High-powered LED provides long-range, high-brightness illumination with wide visibility Standard USB interface allows charging from laptop, phone charger, power bank, and other USB power sources Multi-stage heat dissipation with intelligent cooling system to enhance battery life Waterproof design with one-piece housing, resistant to rain for reliable outdoor use I. Switch Operation: 1. Insert battery with positive electrode facing inward (toward lamp head) and negative electrode outward (toward tail) 2. Tail switch: fully press to turn on/off, lightly press to adjust brightness II. Circuit Board Information: 1. Features constant voltage and constant current technology to meet LED performance requirements 2. Important Notes: A. Do not operate under overvoltage; input voltage must not exceed 4.2V B. Install battery correctly; reverse installation may damage the circuit board C. Monitor temperature changes and ensure proper heat dissipation D. Do not disassemble the circuit board; for professional use only III. Lithium Battery Usage: 1. Lithium battery charging differs from traditional phone batteries; no memory effect, supports anytime charging Avoid overcharging or over-discharging