about this project 1. Emergency black hand crank flashlight with built-in rechargeable battery for convenient power generation Compatible with 1 minute crank for over 10 minutes of lighting (based on a speed of two shots per second). 2. The solar panel is used as a backup power supply method to absorb various light rays, such as strong and moderate sunlight, lights, etc. 3. Ergonomic and sturdy design is comfortable and safe to hold in the hand. Ideal for everyday, emergency and outdoor lighting. 4. Built-in durable carabiner clips securely to your backpack, perfect for outdoor activities. Portable size for outdoor use: 124x45x32mm/86g. Hand Cranks and Solar Power The hand crank only needs to be cranked for 1 minute to illuminate for 8 minutes, and the solar panel generates electricity in almost all lighting conditions. Eliminate the need for plug-in charging and provide power in an environmentally friendly manner. ergonomic design The ergonomic design fits comfortably in your hand. A sturdy built-in carabiner securely attaches to your pack while being lightweight enough to add minimal loads to the road.