Write down all your secret passwords for no one to ever find this magic pen has invisible ink that only shows up when illuminated by a uv light with a stylish chrome and brushed alloy finish and twist open operation its a great looking pen with an invaluable useuse it as a normal pen to write down your precious passwords in the invisible ink then shine the uv light in the cap over the page to reveal what youve written just make sure you choose a special place to write or you might throw