I don't think a knob is the optimal interface for time. In microwaves you need to input both low values of ~10s and very high values of ~600s with good precision on both cases. Sure, a logarithmic knob will give you that, but I don't think it's what you would expect.
For power it's good. It's even a much better interface for the power level than the usual. But then, anything is a much better interface than the usual microwave power level one.
> Wired audio. This device is paired to the device it's physically connected to.
There used to exist those wireless speakers with two pieces, one you physically connected to the audio output on the device, the other had the speaker. The transmission was analog and sucked due to noise, but it was much more reliable and had less lag than bluetooth.
For some reason, instead of fixing it into a digital transmission, everybody just stopped manufacturing the device.