Four original Soviet-made ИН-8-2 (IN-8-2) Nixie tubes with fully-formed "5" digit and neon colon separator
RGB under-tube LED lighting with customisable colour and adjustable rainbow modes
5-Day supercapacitor time backup, with all settings saved permanently
Temperature (°C or °F) and date display, with option to show automatically every 30s, one or five minutes
USB powered with web-based configuration app. Many settings accessible via the built-in buttons