The Makey Makey STEM Pack – Classroom Invention Literacy Kit is designed with classroom collaborations in mind. The STEM Pack comes with 12 Makey Makey Classics plus loads of extra parts that will come in handy when students want to invent something even bigger. Educators appreciate the convenience of the additional accessories provided in a larger storage case.  (Makey Makey works with Chromebooks, Windows, Mac OS, and many flavors of Linux (Ubuntu, etc.). Kit includes: 12 Makey Makey Boards, 12 USB cables, 147 (18 in) alligator clips, 12 (6ft) alligator clips, 144 Ruggedized Connector Wires, 12 (6ft) Connector Wires, 12 Makey Makey Optimized Pencils, 12 Visual Project Start Guides, 1 Printed Educator's Guide