Makey Makey backpacks have invention appeal! Attach any one of these three backpack boards to the black pin headers on the back of your Makey Makey (v.1.4 and higher only!) to access its full set of features. Add a second player to your games, find creative ways to control your computer mouse, and take your inventions to the MAX! Key Features: * 1x Player 2 Backpack * 1x Makey Mouse Backpack * 1x Makey Max Backpack * 14x Alligator Clip Wires * 1x Instruction Card * 1x Makey Makey Sticker