This is a magical pen that, while invisible immediately after writing, makes letters appear vividly when illuminated by a special UV light! It's a very popular item for gifts for children, party entertainment, and secret letter exchanges. Product Features • Secret Messages: The ink is transparent when written and the content remains hidden until the light is applied. • Integrated Pen and Light: A UV light is built into the pen cap (tip of the cap), so you can start playing with it right away. • Colorful 5-Color Set: You will receive a set of 5 pens with different body colors. • *The body colors will be a random selection of 5 colors from blue, red, yellow, green, purple, pink, and black. How to Use 1. Write letters or draw pictures on paper with the pen. 2. Press the switch on the top of the pen to turn on the UV light. 3. Shine the light on the written area, and the hidden message will appear vividly! Important Notes Before Use (Please be sure to read) • Before use, please be sure to pull out the **white "insulating sheet"** from the light part. Removing the sheet allows electricity to flow, enabling the light to turn on. • All ink colors are "transparent." Regardless of the pen body color, the ink will be fluorescent and glow when the light is applied. Recommended for Scenes Like These! • For "secret exchange diaries" with friends • As prizes for birthday parties or Christmas parties • For creating hints (clues) in treasure hunt games • As an educational toy or for free research on the wonders of light We handle overseas products. Please confirm and agree to the following before purchasing. • Product Quality: Compared to Japanese products, there may be some imperfections in stitching (fraying, misalignment, etc.). We conduct thorough inspections, but we would appreciate your understanding of the characteristics of overseas products. • Color: The actual color may appear different from the product image depending on your device's environment. • Returns/Exchanges: We do not accept returns or exchanges for customer convenience such as "difference in image" or "size does not fit." Please be sure to check the size, etc., before purchasing. • Response to Defects: In the unlikely event of a clear oversight on our part (damage, incorrect shipment, etc.), please contact us before rating your purchase. We will respond with sincerity.