These tiny LED modules are perfect for adding lighting effects to your crafts, models, and DIY projects! Each module is incredibly compact - just 0.4 inches in diameter and 0.2 inches tall - so they fit into tight spaces without being noticeable. The coolest feature is the magnetic switch - you can turn the LEDs on and off by bringing a magnet close, meaning you don't need to physically access the module itself. This lets you hide the module inside cases, housings, or model components and control it from the outside. The red LEDs provide bright, clear illumination that's perfect for accent lighting, indicator lights, or creative lighting effects. They run on compact CR927 3V button batteries (not included) that are easy to replace when needed. This 3-pack gives you multiple modules to work with for larger projects or backups. You can use fiber optics with these to conduct light to different areas, opening up even more creative possibilities. Whether you're building custom models, adding lighting to costumes, creating interactive displays, or any project where space is limited but you want reliable lighting control, these magnetic LED modules deliver impressive functionality in a tiny package. The simple operation makes them accessible for beginners while offering enough sophistication for advanced makers.