Under the right hand. Maybe it will be important for someone. In the photo of the product and purchased in 2022, there was a gray USB receiver RN-10D. I had a mouse, keyboard and presenter tied to this receiver. It occupied only one USB connector. The new mouse came with a new USB receiver RN-20M orange. Now either ate the keyboard and presenter, or put up with the fact that two USB connectors are now occupied.
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