Forget the hassle that comes with changing your watch battery. Perfect for outdoor activities, this sporty black rubber band watch uses an automatic generating system to generate and store its own energy, which is created by a simple, subtle movement of your wrist. Smart thinking for foolproof future timekeeping, approved by Field & Stream magazine. A diver-friendly 10 atmosphere water resistance with unidirectional bezel to make it impossible to over-extend your stay below the waves.