The Casio EFS‑S640PB1AVUEF is a stylish men’s analog chronograph from the Edifice series with a sporty yet refined look. It features a solar‑powered movement that converts light into energy, so you don’t have to worry about changing batteries. The watch has a carbon‑reinforced resin case and a durable black resin strap, paired with a sapphire crystal for excellent scratch resistance and clarity. With 100‑meter water resistance, a chronograph stopwatch, date display, and a battery level indicator, it combines practical functionality with rugged reliability. Its sporty design and quality materials make it ideal for everyday wear or active lifestyles.
Specifications
Case size : 50.1 × 44.5 × 13.3 mm
Weight : 59 g
Case and bezel material : Carbon / Stainless steel
Band : Resin Band
Water resistance : 100-metre water resistance
Power supply and battery life : Solar powered
Glass : Sapphire crystal with anti-reflective coating
Surface treatment : Grey ion plated bezel
Compatible band size : 145 to 215 mm
Stopwatch : 1-second stopwatch, Measuring capacity: 29'59
Measuring modes: Elapsed time, split time, 1st-2nd place times
Battery display/alert : Battery level indicator, Low battery alert
Run time : Operating time from full charge until hands stop: Approx. 5 months
Accuracy : ±20 seconds per month
Other features
Regular timekeeping:
Analogue: 3 hands (hour, minute, second), 3 dials (24-hour, stopwatch minutes, stopwatch seconds)
Date display
