The accuracy of PWM timekeeping is achieved by Quartz regulated gear-train motorized movement, at temperatures between 14 degrees Fahrenheit to 140 degrees Fahrenheit. Having an accuracy of +/- 0.45 to +/- 0.55 seconds per 24 hour cycle, accomplished by the precise crystal frequency of the motor at 32.768 kHz. The operating voltage of the gear-train motor is 1.3 to 1.65 Volts DC and an average has a current of 150 micro Amps at 1.5 Volts DC.