The watch uses the low power MSP430G2211 MCU from Texas instruments to control the LED and mesure the time with the help of a 32kHz watch cristal. The MCU sleeps most of the time only waking up ones a second to count up the time and check if the tilt switch is active. To show the time the watch uses 12 charlieplexed orange LEDs. When the watch is activated it shows time by lighting up 2 LEDs at different light strength (PWM levels). The bright LED shows the hour and the dim LED shows minutes in 5 minutes intervals.