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The handles were always an odd shade of green and did not fade like the rest on it. I don't know what the noise is unless it's the bag full whistle. The upside down switch was a carry on from the 500 but why they did this when the 504 didn't I don't know. All I know is that the 502 was a tiny bit earlier than the 504 so maybe it was because the instruction books had already been printed to say the switch started the cleaner when pushed up. I know the 500 book mentions this.