No idea what metal the back plate is made of, but it caused a sever allergic reaction whenever I (or my husband) wore it (and I wore it loosely anyway). In fact, I know I am allergic to nickel, but my husband definitely isn't, so goodness knows what the hell the metal parts are made from.Also, the buttons on both sides are super sensitive, so the display will change as you wear it and your clothing touches the buttons.I bought it before a 3 week trip because I needed a waterproof watch to take to remote areas via boats/canoes and I expected to get very wet (it's definitely waterproof). Unfortunately, it's too late to return now I'm back from my travels.Orologio leggero e dal design divertente ed estivo. Apprezzabile particolarmente la cassa molto piatta rispetto a modelli simili che hanno casse molto più spesse.All'apparenza sembra il solito orologio cinese solo fumo e niente arrosto. Invece è preciso, è sottile e soprattutto ha un'ottima visione del quadrante.
