The Citizen 4-S21575 is a quartz movement with an analog display. It has a height of 2.45mm and a diameter of 18.20mm. The movement features several functions including hours, minutes, and central seconds. It also includes a quick change of the hour hand for time-zone adjustments, a date function with quickset capability, and an end-of-life indicator to monitor battery performance. With 9 jewels, the movement offers a theoretical battery autonomy of 32 months.