This is assembled the IN-12A in-12B Nixie Tubes Clock

Power: 5V/0.3A, (5V adapter, or USB from PC, or powerbank - not included)

Hours, minutes, 24 time display

Tubes are tested and comes from NOS (included) 

Built-in battery socket, time backup during power interruptions (battery CR 1220 3V, not included)

RGB backlight 9 colors

Watch size ~ 4.4 * 1.42 * 1.77 inches.