I don't think it was even that. From the pics, it looks like he liberated a commercial clock from its housing and put it in a different case. Unless it had batt

I don't think it was even that. From the pics, it looks like he liberated a commercial clock from its housing and put it in a different case. Unless it had battery backup, he may have soldered in a 9V battery connector, but since it still has a power cord I kind of doubt it.