GMU-G100: Do two pairs automatically run on different frequencies?

Out of the box, no. Two pairs of the GMU-G100 will not automatically pick different frequencies for you. The good news is that setting them apart takes only a few seconds, and once you do it the pairs stay on those frequencies until you change them again.

Here is how to set two pairs to run on different frequencies:

1. Power on the first pair. The connection should happen automatically.
2. Power on the second pair.
3. On the second pair, press the SET button to change its frequency. The connection should happen automatically.

After that, both pairs remember their frequencies, so you only have to do this once.