✅【INTERESTING SPY ACTIVITIES FOR KIDS】32 Pack invisible pens with built-in UV lights. Batteries included and installed. Please BE CAREFUL with small items: Children above 3 years. If you receive the invisible disappearing ink pen is fall apart or other problems, PLEASE contact us for replacement.✅【WRITE YOUR SECRET MESSAGE】These invisible ink pen with UV light will write your secret message. Once your secret message is written with this spy pens, wait a few seconds shine the light from the cover of the pen and REVEAL MYSTERY OF THE SECRET MESSAGE. Besides, This design with the built-in LED on every pen. This makes every individual marker a complete system for creating and reading invisible messages✅【Safety Material】Harmless and tasteless ink, the ink is a food-grade pigment, healthy for your kids! Smooth and colorful disappearing inks on t-shirts, paper, skin and any surface! Permanent but washable! With 32 in the bag, you can easily host a kid's birthday party favors stocking stuffer, treasure hunt,escape room,or classroom activity complete with invisible ink clues!✅【UV Light Last Long and Ink will not run out quickly】The battery of our invisible disappearing ink pen is button cell, it is replaceable, once the light don't work ,you can contact us for a new button cell.Besides,Ink of this spy pen will not run out quickly if you use it in normal condition.✅【GREAT GIFT FOR GIRLS BOYS FUN PARTY FAVORS】:This uv pen comes in a pack of 32; Assorted colors to make the activity like Wedding RSVPs,Black Light Party more exciting and fun; Parents could buy it for their kid's party at home; These would be a treat for kids who like secret spy games, crime-solving or super-hero games, for those who like passing secret notes or leaving clues that only certain people can see.Teachers can buy it for students for treasure hunt, or classroom activity.