I've googled around a bit and here are the interpretations I've found in non-authoritative sources:
- that the device is unable to filter out interference caused by other certified equipment
- that if there is interference, the device must not "complain" about it (whatever that means)
- that if there is interference and your device fails to work, you must not complain about it (i.e. you cannot sue for failure to perform the function)
- that if there is interference, the device can't do anything about it (though I can't think what it possibly could do about this other than actively seek out the source and shut it down, sci-fi style)
- that the device is actually required to work correctly regardless of any interference
So what does this phrasing actually mean? Is it phrased poorly or am I misunderstanding it as a result of not being a native speaker?