• Atomic (US only) - Receives the signal from the Atomic clock in Ft. Collins, Colorado

For a modern look, the Casio Men's G-Shock Atomic Tough Solar Watch #GW530A-1V features an easy-to-read digital-gray dial face, which is protected by a mineral dial window. A day-date-and-month calendar brings at-a-glance readability. Other details include a world-time-zone tracker, a stopwatch, and a 4-daily-alarm-with-snooze option. The stylish band is made of black resin for a sleek look, and it comes equipped with a secure buckle closure. The watch also features a stationary resin bezel and 46.3-millimeter stainless steel case. Designed to accommodate your many needs, this handsome timepiece ensures highly reliable technological precision. It is powered by solar movement and is water resistant to 660 feet.

I love this watch! It was a bit of a challenge getting used to the three dials at the top of the watch but I finally figured it out. No problem receiving atomic signal!

This watch is amazing. My favorite two features are: the atomic receiving function and the solar charging. My last G-Shock broke after getting the battery replaced. With solar charging I don't have to worry about replacing the battery. The only function that I can think of which it lacks, is a countdown timer (but I don't need that). A fun feature it has is: when you tilt the watch towards your face (in the dark) the back light comes on.

The Model GW530A-1V G-Shock is the original G-Shock, and is the one that I always wear. It keeps perfect time and as far as I can tell, it's impervious to any type of shock or abuse that you might encounter; that's what it was made for. Also, has great features, stop watch, timer & back light, etc. I highly recommend this product.

As a kid I was a digital watch nut, then for a long time I wore the more dressy analog style watches. Somehow I came across the newer Gshock watches and was amazed at the technology they packed into such a small device. So I decided to go with a solar powered atomic watch and this is the model I chose out of looks and the fact that the display constantly shows month, day, and date.

Other reviews have covered the functionality, comfort, and ease of use. I thought I would instead touch on a few unique features I didn't know until after the purchase. More of a fun facts list, if you will:

-At night, the watch enters an energy save mode beginning at 11PM. The entire screen goes blank while you sleep and will remain off until the screen is exposed to bright light or you press any button. You can end the energy save mode at any time during the night, but if you're asleep in the dark so is your watch.
-During the normal energy save time at night is when the Atomic update occurs automatically. Starting at 2AM your watch will scan for the Atomic signal for its daily update. It will then scan at 3AM, 4AM, and 5AM as well, regardless of if it worked on the first attempt or not. You can later check to see what date and time the last atomic update occurred. You can also manually update whenever you wish.
-If it's dark and you look at your watch the backlight will automatically turn on for 1 second so you can view the time. The internal sensor detects when you have your arm at your side vs. when you raise your arm parallel to the ground in the typical "watch viewing" position. When you reach that angle, the light comes on without you needing to press any buttons.
-If you travel it's easy to set your watch to any timezone simply by scrolling through the list of cities already stored in the watch. Just pick a city in your current timezone and you're set.
-I've successfully received atomic updates in Fort Lauderdale, Atlanta, Knoxville TN, Sheboygan WI, and Southern California. It's hard to get an update inside or around large buildings. Quite easy to receive an update at the beach or in open outdoor areas.

Overall I'm very pleased with the purchase. Amazon shipped quickly and safely. The watch feels very durable and I imagine it will last for many many years.

When I checked around online for the best price of this exact watch, Amazon was selling for like $30 cheaper. It's a perfect watch, especially if you're a P.E. teacher.