This is a device used in fishing that emits flashes of light, such as for use with worms or other items that store light. The uses and instructions are described on the front and back of the package. It was very useful. However, whether it affects the catch depends on your skill, but I think it's better to use it than not. It's really tough when you're the only one not catching anything, and conversely, the feeling of superiority when you're the only one catching fish like crazy is unbeatable, right? I used it for night fishing, but the frequency of use was very low. It's a bit old, but the light still works. Please do not look directly at the light as it is dazzling, especially children. (Light emission confirmed) Please provide your own batteries. I no longer fish, so I would like to pass it on to someone who needs it. Press and hold the light button for a bit longer than usual. Please note that I will not respond to comments asking for a price reduction. If you like it, please consider the listed price. As a bonus, I will include a nylon wire to prevent it from falling. It's just a bonus, so I recommend replacing it with a new one. It will be wrapped in bubble wrap for delivery. Please note that returns are not accepted after purchase. Thank you.