The Casio AQ-S820W-3BVEF is a robust analogue-digital sports watch that combines solar-powered reliability with practical functionality and everyday versatility. Inspired by aircraft instrument panels, its green resin strap and round black-dial case create a rugged, outdoor-ready aesthetic while maintaining a clear, easy-to-read display. This model reflects Casio’s focus on delivering dependable performance with thoughtful design for active lifestyles.

Tough Solar Power and Efficient Timekeeping
Powered by Casio’s Tough Solar technology, the watch harnesses energy from natural and artificial light to maintain operation without conventional battery changes. A battery power indicator and power-saving function extend the watch’s endurance, with typical power reserves lasting around 10 months under normal use and up to 23 months in power-save mode after a full charge. The analog hands show hours and minutes, while the LCD panel presents day, date and additional functions for comprehensive timekeeping.

Durability and Water Capability
Built for resilience, the case and resin strap contribute to a lightweight yet sturdy construction measuring approximately 52.5 × 50.1 × 12.7mm with a total weight around 46g. Water resistance to 100 metres (10 bar) permits swimming and daily water exposure with confidence, reinforcing its suitability for daily wear, travel and outdoor activities.

Functional Features for Daily Use
The AQ-S820W-3BVEF delivers a host of practical features including world time across 31 time zones (48 cities + UTC) with daylight saving on/off, a 1/100-second stopwatch, two countdown timers, five daily alarms with hourly signal, and a full automatic calendar through 2099. An LED backlight with selectable illumination duration ensures visibility in low-light conditions, while selectable 12/24-hour formats and optional button tone mute add everyday convenience.

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