The 'crying' invoice invented

Excerpt from Australian Anthill: Did you know, in Australia, it takes an average 51.8 days to get paid, according to Dunn & Bradstreet? Frustration with tardy debtors was the obvious impetus behind this nifty invention from Belgium outfit ikki; an invoice with a voice-chip that begins to make weeping noises 20 seconds after the envelope is opened. (How? The chip reacts to light.).
However, what’s truly inventive about the ‘crying invoice’ is its other purpose. Read the full story or see how the crying invoice works.