Cross-Border New Three Source XPE Sensor Built-in Battery USB Charging COB Red Blue Light Outdoor Small Headlight

[Model] 4120 Light bulb XPE+COB LED [Product Dimensions] 6*4*3CM Net weight 60G [Box size] 7*6.5*5.5CM Gross weight 104G [Material] ABS [Switch] Dual push-button switch (position switch + sensor switch) Battery Built-in 1200mAh polymer lithium battery [Charging method] microUSB charging [Position] 5-position switch: XPE strong light - XPE weak light - COB strong light - LED red light - alternating LED red and blue light Sensing switch 3 modes: XPE strong light - XPE weak light - COB strong light Zoom Mode Fixed focus Waterproof rating IPX4 Lumen 300-400 lumens Range 50- 100m [Features] 60 levels of brightness adjustment, sensor-controlled at any setting, adjustable headlamp strap, comfortable to wear; compact and lightweight, suitable for outdoor sports, cycling, fishing, etc [Indicator light] Charging indicator light [Charging time] 2-3 hours Battery life 3-6 hours [Package includes] Color box + headlamp + headlamp strap + USB cable 240 each 1. Check the battery: Make sure the battery has power and insert it into the flashlight in the correct direction. Do not use batteries of different brands, and do not mix old and new batteries. 2. Determine the fault: Unscrew the back part to expose the negative terminal of the battery, then use a metal piece such as a key or tweezers to connect the negative terminal of the battery to the exposed, unoxidized part of the flashlight body, and see if it lights up.If possible, it's a problem with the flashlight switch.Please follow step 3 for inspection. If it still doesn't light up, please check the solder joints between the circuit compartment and the circuit board for any open or loose welds. If there are any, please re-solder them to resolve the issue. 3. Check the tail cover switch: Unscrew the end of the flashlight and you will see that the outer ring of the switch cap has a switch pressure ring with two recesses. Use scissors or a sturdy pair of tweezers to insert into the two recesses and turn clockwise to check if the switch pressure ring is loose. Make sure the switch pressure ring is tightly pressed against the switch and there should be no looseness. 4. Check for poor contact: When the flashlight does not light up or has poor contact, check whether the lamp head is loose, inspect the tail cap to ensure the switch is tightly screwed and well-connected, and ensure that the copper post of the tail cap is in good contact with the metal ring of the tail cap. 5. Other issues: If the above methods still cannot resolve the issue, please contact our customer service, and we will assist you in resolving the problem.