The Casio Solar AQ-S820W-1AVEF men's watch from the Timeless Collection series is a model with a solar mechanism that draws energy from light. The black plastic envelope is 50 mm wide, and the dial of the same color is covered by a hessalite glass. A black rubber strap ensures comfortable wear. The watch has a water resistance of 100 meters, which allows contact with water. It is equipped with a dial backlight, a stopwatch with an accuracy of 1/100th of a second and a measurement time of up to 1 hour, and two timers with auto-repeat and a time of up to 100 hours. The model has five daily alarms, an automatic calendar and a display of the days of the week in different languages. A 12- or 24-hour format and a world time function are available. The watch has button beeps for easy operation.