Power source and battery life: Tough Solar (solar recharging system). Structure: Shock-resistant structure (shock resist). Accuracy: Average monthly difference: ±15 seconds (when not receiving a signal).
If there were one Gshock to buy, I would recommend this model. It's a modern reinterpretation of the original Gshock first introduced nearly 40 years ago with the latest module and the most comfortable resin strap I have yet to experience from a Casio Gshock.