Casio Men's G-Shock GWM5610-1 Tough Solar Black Resin Sport Watch Imported Auto light feature will not work if the battery level falls below Medium (marked as M on the face of the watch). Turn on or off the auto light function by holding down the light button and turn wrist at a 40 degree angle towards the user in a dark environment Casual solar-powered watch with multiple functions including multi-band atomic timekeeping, shock resistance, EL backlight, world time (29 time zones, 48 cities), city code display, five daily alarms, 1/100-second stopwatch, countdown timer, full auto-calendar, battery indicator, and power-saving function Approximate battery life: 10 months on full charge (without further exposure to light) Water resistant to 200 m (660 ft): In general, suitable for professional marine activity and serious surface water sports, but not scuba diving You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it! Covers broken watchband, movement failures, cracked crystal, bezel damage and more. Includes a 1-time refurbishment. No deductibles or hidden fees. Free shipping on all repairs. Fully transferable. Easy claims process online or by phone 24/7. If we can't fix it, we will send you an Amazon e-Card for full replacement value. Coverage begins date of purchase and is inclusive of the manufacturer's warranty. Plan is fully refunded if canceled within 30 days. Plan contract will be emailed from Asurion within 48 hours of purchase. This will not ship with your product.