The Citizen 4-G03987 watch movement features a manual winding mechanism, an hour hand, a minute hand, and a small second subdial. It operates at a frequency of 28,800 vibrations per hour and has a power reserve of approximately 48 hours. The movement includes a hacking function, allowing for precise time-setting. Its design incorporates 25 jewels, reducing friction and enhancing durability. The movement also incorporates a shock protection system to protect against impacts. The movement has a diameter of 28.8mm and a thickness of 4.35mm, making it suitable for a variety of watch case sizes.