I just ordered a third one for our office as they *just work* and work great for us and I have one at home that connects to a mining rig. I literally have no idea how they transmit their signals. You would think it was IR since the devices have a blaster and receiver, but during the presentations I noticed people had laptops/bodies blocking the direct path and STILL keep working. They worked seamlessly with Powerpoint/Excel on corporate videos. The mining farm at home has one, and even in that room the signal is often blocked by a coat hanger and it STILL works. Note: I don't play with it at home (or in the office!), lag but definitely didn't notice during our office tasks.
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