1、IP68 dustproof and waterproof, cold resistance of minus ten degrees, can work in the environment of ‑10°C~60°C. 2、Adopt constant current circuit, constant brightness without flicker, no harm to eyes, and effectively reduces eye pressure and visual fatigue. 3、The tail magnetic function can be adsorbed on the surface of ferrous metal material, freeing your hands. 4、Trapezoidal thread, durable, gold‑plated spring, anti‑oxidation and anti‑corrosion. 5、Stable holding clip + convenient storage bag, giving you a relaxing outdoor travel experience. 6、21700 4800mAh large‑capacity lithium battery, convenient USB charging and discharging design, can be used as an emergency power bank. Item Type: LED Flashlight Material: Aluminum Alloy Color: Black Size: Approx. 124.5x31mm/4.9x1.2in Weight: Approx. 420.0g/14.8oz Lamp Beads: 4Pcs for SAMSUNG LH351D LED Battery: 1Pcs 4800mAh 21700 Lithium Battery (built-in) Luminous Flux: 2800lm Maximum Battery Life: 125 hours The Longest Range: 146 meters Waterproof: IP68 How to use 1. Turn on/off: click the power button to turn on/off the flashlight 2. Gear adjustment: In the power-on state, click the W key to switch gears cyclically (the gear is set to "slightly bright-low bright-medium bright-high bright", cycle switching, with gear memory) 3. One key low light: In the shutdown state, press and hold the power key for 1 second to enter the moonlight mode (1lm) 4. Extremely bright mode: In the power-on state, long press the power button to enter the extremely bright mode and lock it, long press the power button to return to the previous mode, and click the W button to return to the slightly bright mode (10lm); in the off state, long press W key to enter extremely bright gear, not locked 5. Flashing mode: In the shutdown state, press and hold the power button for 2 seconds to enter the flashing flash, click the W button to switch the flashing gears cyclically: "Flashing-1 second flashing -10 seconds flashing-SOS 6. Flashlight lock: locked, in the off state, press and hold the power button for 8 seconds to lock (the flashlight flashes and then turn off), unlock, in the off state, press and hold the power button for 5 seconds to unlock (the flashlight is turned on at low gear) 1 x LED Flashlight 1 x Storage Bag 1 x USB Charging Cable 1 x Strap 1 x Battery Cover 2 x Spare Waterproof Ring 1 x Manual