The Casio Digital W738H-1B is a square-face digital watch designed with everyday practicality and comfort in mind. It features a mid-size case measuring 47.0 × 42.8 × 13.5 mm and weighs just 43 g, making it lightweight and easy to wear throughout the day. Powered by Module No. 3588, it offers reliable long-term performance with an approximate 10-year battery life (CR2032) and an accuracy of ±30 seconds per month. Built for convenience, it includes an LED backlight with afterglow, dual time, and a versatile 1/100-second stopwatch with elapsed time, split time, and 1st–2nd place functions, plus a 5-second auto start. The 24-hour countdown timer allows flexible timing from 1 second up to 24 hours. For alerts, it features a daily alarm with countdown functionality, hourly time signal, and vibration alerts across alarm, timer, stopwatch, and hourly notifications. Usability is enhanced through a large, easy-to-read LCD display, 12/24-hour format options, and a full auto-calendar programmed to 2099. The watch also includes button tone on/off control and clearly differentiated controls, including a dedicated vibration-setting button for easy operation. The design is further refined with a shorter hole-pitch band for a more precise fit, helping ensure vibration alerts are effectively transmitted to the wrist. - Module No. 3588 - 47.0 x 42.8 x 13.5mm Case Size - 43g Weight - LED backlight (afterglow) - Dual time - 1/100-sec stopwatch (elapsed, split, 1st–2nd) + 5-sec auto start - 24-hour countdown timer (1 sec–24 hrs) - Daily alarm with countdown + hourly time signal - Vibration alerts (alarm, timer, stopwatch, hourly signal) - Full auto-calendar (to 2099) - 12/24-hour format - Button tone on/off - Regular timekeeping (time, date, day) - Accuracy: ±30 sec/month - Battery life: ~10 years (CR2032)