This Analog Way NXT1604-4K NeXtage 16 4K Seamless Switcher has a runtime of 36,203 hours and 13 running cycles. It comes with the correct power supply. The firmware version is v04.02 Build 77. One minor issue is that the key cap for source 7 is missing, but it doesn't affect the switcher's functionality.

Using this switcher is quite straightforward. First, make sure you connect it to the correct power supply that comes with it. You can then start your operations as normal. Regarding the missing key cap for source 7, don't worry as it won't stop the switcher from working properly. As for maintenance, keep it in a clean and dry place. Periodically check the connections to ensure everything is secure. If you notice any other issues, it's best to get it checked by a professional.