Bluetooth mouse
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I don't know, maybe the laser is a bigger power hog. I've got good rechargables, and they're far enough from my hand that heating shouldn't be an issue (at body temp rechargables loose several percent of thier charge daily).
-- Rules of thumb should not be taken for the whole hand.
Hmm, I guess that's another concern for the OP. The trackball is optical but probably has a less powerful laser than a regular mouse. So my input should probably be ignored... :)
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