It's fantastic and classic at the same time. It is in fact illumination through nixie tubes, also known as cold cathode displays, a technology that the world wrote off long ago in favor of digital, that has kept the project alive through years of iterations and design processes. Coalescing the complex mechanics of watch design and engineering, the elegance and usability of product design, and the sheer radiance of its enchanting visual and light design, SPARK is a wearable device that may not be smart but has oodles of old-world charm, an unsubtle blend of an industrial aesthetic and eye-catching neon.

__________________OPERATION MANUAL__________________
COPY AND PASTE TO THE NEW BROWSER TAB LINK:

http://tiny.cc/INw_21

__________________VIDEO__________________________________

VIDEO is for IN-16 but the features are the same:

http://tiny.cc/INw_spark21

_________________MAIN____________________________________

Fully Assembled!!!

Include vintage NIXIE tubes, soldered board, faux leather straps

Straps can be changed with any other. The end link spring bars lengths are 24mm.

_________________ SOFTWARE FEATURES________________

New NIXIE tubes (comes from 1980-1990).
Display hours, and minutes (12 or 24 hours format optional).
Delays between values can be adjusted
Seconds can be reset to zeros
Display date (DD/MM, MM/DD) (can be turned off)
Display temperature (Celsius or Fahrenheit) (can be turned off)
Visual effects (can be turned off)
The first tube can be disabled in a value lower than 10
Backlight LEDs can be adjusted to 8 colors and also help to navigate the menu

Display battery (Li-ion 3.7V) 2000 button pressings and over 30 days in standby mode
Simple time setting using one button or remote control
Tubes are driven by high-frequency dynamical indication and provide service for many years
All settings are stored in non-volatile memory

________________HARDWARE FEATURES___________________

Tubes type: NEW NIXIE tubes 1980-1990
Charge: DC 5V and micro-USB plug (Power cord and adapter are NOT INCLUDED)
Dimensions: 52x17,5mm
Weight with strap: <100gr
Time accuracy (+/- 1 second per month) is provided by built-in RTC (Real Time Clock) based on an extremely precise DS3231 module with temperature compensation
Not AC frequency dependent – works in all countries.

The power cord and power supply are NOT INCLUDED!
Any micro-USB cord (usually used for smartphones) can be used and also any free USB port.
You can use your own or buy it in the local market.