if it looks like a mouse and squeaks like a mouse.
This looks like the popular Intellimouse and Explorer by Microsoft. They are much lighter, signaling that there is some compromise in the electronics or structural integrity. That may not be an issue, as I've been using one for 6 months now with no problems. The scroll wheel/button works fine, which is often a problem with mice. My main complaints: too light, would be nice to have those soft pads underneath to help in sliding, and no shoulder buttons, which do come in handy. So I give it a 4 out of 5.
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