Inside the 3920P
Upon opening the cover, we do indeed find the small hole in the center to store the nano receiver, but this is the second time our mouse arrived without batteries. Just to make sure we were not crazy: It does say there are two pre-installed AA alkaline batteries, right? So what gives here?
Moving on, we were able to take the 3920P apart by removing just two screws; it easily splits in two. With this view, you really get the sense of how compact this mouse is, and just how close together those components are.
Under the left click button, we find the first of two Kailh white switches, which are heavily greased. These switches offer an audible click when used, and require medium force to activate while still having a nice feel.
Moving around the inside a bit, we can now see the black pad style switch used for the DPI switch behind the scroll wheel. We also see the Avago A8020 laser sensor that uses the Sufree technology to allow this sensor to track on any sort of surface, and still retain accuracy.
The pair of buttons on the left side of the 3920P also use the same black pad switch we saw for the DPI. All three offer more of a thud when pressed, and are much springier than the Kailh switch.
Speaking of Kailh switches, since we had one under the left side, it only makes sense to find one under the right side as well. However, this time less grease has been applied, but we do use the left click much more often.
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