This is a custom enclosure for the Adafruit MintyBoost USB Charger. I wanted to add an on/off switch and storage for a USB cable which the original Altoids can didn't allow. The box is designed to fit a Radio Shack switch #275-0409 and a shorty micro USB cable which I got from NewEgg #N82E16812705131. Use M2 or #2 screws for the switch - it will be a bit of a pain due to space constraints so install it before the board and batteries. The board will need the foamy double-sided tape (which comes with MintyBoost) to install at the correct height for the USB hole.