I have a couple of Pure binax 5's and I know the tune that they play when the battery(s) gets low yet this is new and diverse. The first occasion when I heard it was about a month back and I have heard it three times from that point forward. It is certainly an alternate tune and it is likewise louder than the low battery tune. Nothing changes when or after the tune is played however I haven't the faintest idea of why it is going on. I checked the manual however no euphoria. Does anybody know about a tune with the exception of the low battery flag or has anybody had a wonder such as this happen?