From the manufacturer

G-SHOCK

The most durable digital and analog-digital watches in the industry, trusted by military personnel, law enforcement, surfers and outdoor enthusiasts around the world.

Pursuing Absolute Toughness

Shock resistance

Shock-resistant construction protects against all sorts of impact and vibration.

20-bar water resistance

You can wear your G-SHOCK in all sorts of situations, from working with water in daily life and taking a shower to participating in water activities such as swimming, surfing or jet skiing.

Backlight

With the back-light, you can see the watch face in any situations without light.

Solar Atomic

Atomic Timekeeping

Multi-Band 6 Atomic Timekeeping.

Receives time calibration radio signals which keep the displayed time accurate Auto receive function (up to 6 times per day/up to 5 times per day for China)

Tough Solar Power

Casio's original solar-charging system converts not only sunlight but also light from florescent lamps and other sources into power.

Depending on the model a tough solar powered G-Shock's charge can last from 12-24 months on a full charge without any exposure to light.

Auto Backlight

While Auto Light is enabled, display illumination will turn on whenever your wrist tilted at a 45 degree angle