3 AA battery box with Alligator-clip-friendly connection points and built-in resettable fuse to protect against short-circuits. The on-board green LED shows when the switch is on. A red LED will light when the fuse has been tripped (most likely due to a short circuit somewhere among the connections).

     Crumble Resources    

Check out these guides from Crumble's manufacturer to get set up and programming!

• Getting Started: Link
• Software You'll Need: Link
• Learn Programming Concepts: Link