Write secret messages or search for clues with the Spy Gear Spy Light Kit! To write secret messages to other agents, remove the spray dispenser and dip the brush end into the invisible ink bottle and write out your message on any surface. Use the Spy Light Wand to reveal the message! When its time to collect clues to solve your mission, spray the surface with invisible ink. The dried ink traps fingerprints, and once you shine the light over the surface they are revealed so you can find your culprit! Gear up and become the ultimate secret agent with the Spy Gear Spy Light Kit! Batteries included.