Color classification: black, silver, red. Use a 5V adapter (USB charging head) for power supply, and we have a USB cable attached.
It only needs to be calibrated once, and it will not be wrong to power off afterwards. The item "NIXIE CLOCK Table Tube Desk Pixels Large Display Ref Nixie Clock" is in sale since Tuesday, May 18, 2021. This item is in the category "Home & Garden\Home Décor\Clocks\Alarm Clocks & Clock Radios". The seller is "fadi_store1" and is located in hong kong. This item can be shipped worldwide.