Casio mens g steel alarm chronograph watch gst w100d 1a4er specifications brand casio packaging casio packaging case width approx 47mm case depth approx 16mm gender mens dial colour black date yes clasp type fold over case material stainless steel strap type metal bracelet strap colour silver water resistance 200 metres movement tough solar chronograph yes mpn gst w100d 1a4er guarantee casio 2 year guarantee