Invisible Ink Pen Party Favors: the package includes 4 pcs silver UV blacklight flashlights ( batteries not included), and 4 pcs blacklight pens with light; Customers can write their secret messages on the paper, which can only be revealed by shining it with UV light, suitable for spy games, family activities, back to school activities
Reliable and Safe: this black light flashlight mini is made of quality waterproof and impact proof aluminum alloy, so it can be applied on rainy days; The disappearing ink pen is made with washable, safe ink and a sturdy plastic body
Suitable Size: this invisible ink pen measures 5.75 x 0.43 inch, which is portable and easily put into your packet or bag; The UV light flashlights vary in sizes of 5.24 inch and 3.58 inch; Customers can use the invisible pen to draw, doodle and write down their thoughts, discover hidden messages and create their own secret codes, suitable for playing games such as escape room, treasure hunt, riddles, detective games, skin tattoos, etc
Multipurpose Use: the mini UV LED light is compact enough to fit or clip into your pocket, backpack, easy to store; Suitable for walking, power outages, emergencies, general use, daily carry, backup light source, boating, camping or indoor use in home, car, etc. The portable black light flashlight set can also be applied to detect animal urine, pet stains, food stains, room cleaning, easily verify currency, etc
Usage Instructions: while our invisible ink marker add fun and functionality to your life, it's important to note that they are invisible/ colorless in normal light, and to witness the glowing effect you must have a dark light; Tips: the long flashlight requires 2 3A batteries, the short flashlight requires 1 3A battery, the batteries are not included
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