T40 High Power 3000 Lumen Strong Light Flashlight Tube Spotlight Type Long Range USB Direct Charging Patrol Security Flashlight

1. Check the battery: make sure that the battery has electricity and the battery is installed in the correct direction. Batteries of different brands cannot be used. New and old batteries cannot be mixed.
2. Check tail hood: make sure that the switch is tightened and in good contact, ensure that the tail Hood copper cylinder is in good contact with the tail Hood pressure ring metal sheet, pay attention to whether the lamp holder is loose