• Connect power supply, and you're OK. It works out of the box
• Third bar shows a voltmeter, remainder bars perform random light plays
• Obviously this can be redefined to anything by firmware upgrade

As per ALL our boards, you have 3 options for firmware upgrade, choose what best suits your needs or likes:

• Our CPUs are socketed: remove old chip, inserted new chip
  It takes less than 10 seconds, follow videoinstructions

• Ship board here: we do the job for you for free (you pay shipping fees)
• We use standard reprogramming connector:
  Use ANY commercial USB AVR programmer (price: <$10 on eBay)
  Use ANY programming software (price: free)

If you like, you may "park" the programmer behind the board and have permanent USB reprogramming connector for a few bucks, to reprogram anytime you wish, if you need it.