Useless Box Kit - The Original Useless Box Kit, Also Known As the Useless Machine or Perpetual Machine, A Perfect fit for Geek Gifts Desk Toys or a Cool Gadgets Gift ENDLESS FUN: A totally useless box that provides endless fun! With this perpetual machine every time you flip the switch on, a little finger pops out and turns itself off! EXCLUSIVE VERSION: Exclusive Red LED included. Make your box glow red! A professional looking but incredibly funny desk gadget, a desk novelty that won't be forgotten. DIY KIT: The Black Do It Yourself Useless Box Kit does not come assembled. A great geek gift and soldering kit gift. Perfect as a cool teen gadget gift. WHAT'S REQUIRED: Requires two (2) AA Batteries to run and a Soldering Iron to Assemble, both not included. Search "Fully Assembled Useless Box" for a fully assembled version or our useless machine that even includes batteries!