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You can see how the battery pack fits in the bottom of the base. The driver circuit is inside the base, on the other side of the battery pack. I carved the hole for the plug from the other side, so it's recessed a little. I drew pictures of a battery and a wall plug on the switch to explain how to switch it from one to the other. Ideally, I would have used a three way switch so you could turn it off without unplugging it or taking out its batteries. But I had already carved the hole for that switch, and didn't have another piece of pumice to use instead.