Nixie Tube Clock, 4-Digit, IN-12 Tubes, Green

This is a Nixie tube clock module with an original case. The case is designed with a retro feel, inspired by old desk clocks. It uses genuine Nixie tubes (IN-12B, made in the Soviet Union).

In addition to the main unit, it comes with an AC adapter (shows signs of use), a USB cable, and a silicone cleaning cloth.

Features include 24/12 hour display switching, an effect that animates the display every minute, and a backlight function.
There is no instruction manual, so please refer to the following for operation:

?Changing backlight color
　Press and hold SW2: Color changes
　Red → Green → Blue → Pink → Yellow → Cyan → Pink →
　Changes daily? → Off → Red...

?Setting the time
　Short press SW2:
　1st press: Enter time setting mode
　2nd press onwards: Select the digit to change
　Short press SW1: Increment the flashing digit by 1

?12/24 hour display switching:
　Short press SW1 when not in time setting mode

?Sleep mode?
　Long press SW1 when not in time setting mode
　Normal display → Does not display digits late at night? →
　Displays 00:00 late at night? → Normal display...
　(Uncertain about the exact behavior)

?Purpose of the battery
　The button battery on the back of the unit prevents the time from resetting when the power is disconnected.
　If the battery is depleted, insert a thin object into the metal part to remove the battery and replace it with a new one.
　Battery: CR1220

?Notes
　※The colon's illumination may change.
　※Nixie tubes are made of glass. Please be careful not to drop the clock or apply strong force.
　※The ruler shown in the photos is not included.
　※The case has a heat resistance of 50℃. Do not use it near windows with direct sunlight or in cars.

Style: Simple/Basic
Function: 24/12 hour display switching
Display format: Digital