An awesome glowing digital desk clock with 4 Nixie tubes. The Nixie Tube Digital Clock is fitted with rare western made ZM1000R type Nixie tubes seated on their (even rarer) original sockets. The clock is hand-soldered, hand-assembled, and tested. It will keep track of time even with no power connected thanks to the large internal supercapacitor. It comes with a printed user manual and one-year limited warranty. You will need to provide your own 9VDC 500mA wall-plug power adapter with a standard 5.5mm/2.1mm circular connector.