[Model] 2054 [Light Bulb] XPE+COB [Product Dimensions] 8CM*4CM*2.5CM [Box size] 9*6.5*6.5CM [Net Weight] 88G [Battery] Built-in 1200mAh lithium battery [Charging Method] micro USB charging [Material] Aluminum alloy + ABS [Switch] Press the switch [Mode] 2nd mode: XPE strong light - COB strong light [Features] Equipped with magnets, the head is detachable 1. The manufacturer provides genuine products directly from the source. The company has a short production cycle, product quality is guaranteed, and supply is stable. We welcome new and returning customers to place orders with us. 2. Regarding the size, the measurements are taken manually, and due to differences in measuring tools and methods, there may be a 2mm error. Please understand. 3. The main color is black, but other colors can be customized. Due to differences in computer display screens, there may be a slight color difference between the actual product and the picture. 4. Regarding customer service, your inquiry was not responded to promptly, possibly due to high inquiry volume or a system malfunction. We apologize for this and will respond to your question as soon as possible. 5. Regarding after-sales service, we will provide comprehensive after-sales support. We will provide warranty for any damage to the product's exterior and light bulbs, and guarantee the authenticity of our products. 6. Regarding shipping, the courier companies we cooperate with are YTO Express, STO Express, U-Speed, and SF Express.There are also various freight companies that can ensure the timely delivery of your goods. Regarding inspection and maintenance: Our company's products are thoroughly inspected before shipment to ensure there are no issues before they are released, and generally, there are no problems.However, during transportation, due to bumps, moisture, and other factors, some problems are inevitable.If the light source does not light up or only emits a dim light, please follow the following methods for repair: Before performing maintenance, please ensure that all the threads of the flashlight are tightly tightened and not loose. If some threads are not tightly tightened, it may also be the cause of the flashlight not lighting up or only lighting up dimly. 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.