It's 2.5 inches wide. The e7 is 2.375 wide if I recall correctly. The big battery version is 2.88" and that's why it's not the production version. Sunbox E7 40w and 5 hours mine is 200w @5hrs. 60-80w much longer.
Consider the size to be a child deterrent. It doesn't look or feel like a toy like some of the ridiculously small
mods do. Much smaller than a Cadecus with a lot more flexibility and battery monitoring safety. If the 200 senses and imbalance in the cells it tells you so and shuts down for its protection and yours, NO other board does that.
Btw: I wear a size 9 glove or a men's medium/large.
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Also the actual production model should be slightly smaller, the battery compartment on the one pictured is oversized due to it being produced on a $750 mill with no DRO. I should have 3D renderings of the actual cnc file in a few days.