Let me start by saying that it's very small - even smaller than a Logitech mini mouse. I have ergonomic issues with standard sizes so I always use the mini. It fits my hand very well, but I think someone with big hands might find it difficult. The reason I put "battery" in the title is because it came with one, but so far I haven't been able to find where to put a replacement once it wears out! When this happens I will do more to find a gap. I tried a few logical spots that didn't work, but for now I didn't want to break it.
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