This clock kit by Adafruit is made with a retro Russian display tube!
    * Cool glowing blue tube with 8 digits, PM dot and alarm on/off indicator
    * Adjustable brightness
    * Alarm with volume adjust
    * Precision watch crystal keeps time with under 20ppm (0.0002%) error (< 2 seconds a day)
    * Clear acrylic enclosure protects clock from you and you from clock
    * Battery backup will let the clock keep the time for up to 2 weeks without power
    * Selectable 12h or 24h display
    * Displays day and date on button press
    * 10 minute snooze
    * Integrated boost converter so it can run off of standard DC wall adapters, works in any country regardless of mains power
    * Great for desk or night table use, the clock measures 4.9" x 2.9" x 1.3" (12.5cm x 7.4cm x 3.3cm)
    * Completely open source hardware and software, ready to be hacked and modded