Casio Collection AQ-S820W-3BVEF, a watch made for everyday wear that lets you forget about battery changes, since it runs on solar energy.

• Analog-digital.
• Black dial with luminous hands and indices.
• Display showing the watch's various functions.
• Green resin case and strap.
• LED light.
• Solar: recharges with energy from both natural and artificial light through solar cells, and surplus energy is stored in a rechargeable battery.
• World time for 29 different time zones.
• Stopwatch, 1/100-second, 1-hour.
• 2 independent timers with auto-repeat, in 5-second increments up to 100 hours.
• 5 daily alarms so you don't forget any important event.
• Button sounds that can be turned on or off.
• Auto calendar.
  
• Low battery indicator.
• Water resistant to 100 m.
• 3-year warranty.