Multifunction Luminous Light Invisible Ink Pen UV Big Head Magic Money Detector LED Light Pen Toy Pen Describe Creative invisible light pen, the ink is invisible ink, writing can not be seen, you need to light to see. Built-in ultraviolet light, children will write a lot of secret messages to each other, invisible to the naked eye, ultraviolet light will appear on the text Note: You can write on most surfaces, but whether you can stay on the surface depends on what material you write. If you write on paper, it can be kept forever; if you write on metal or plastic It may not last long because it can be easily erased due to the properties of metal and plastic. Pecification Color: Red, yellow, green, blue, purple, black, pink Weight: about 10g Material: plastic Size: about 13.5x1x1cm/5.31x0.39x0.39 inches Include 1X invisible ink pen Tips: 1. Due to the different display and lighting effects, the actual color may be slightly different from the picture color. 2. Due to manual measurement, please allow a difference of 1-5cm, thank you! 3.Comes with button batteries, the batteries have protective inserts, please pull out before use. Herrnalise dedicate to providing our customers with the best shopping experience. Our products have quality assurance, you can rest assured to buy. Thank you very much for supporting Herrnalise, your support makes us do better! Don't hesitate to join Herrnalise! If you have any questions, please feel free to contact our customer service, our customer service will reply as soon as possible within 48 hours on working days.