Casio unisex classic alarm chronograph watch f 91wc 3aef specifications brand casio packaging casio packaging case width approx 37mm case depth approx 9mm gender unisex dial colour lcd date yes clasp type strap buckle case material plasticresin strap type rubber strap colour green water resistance water resistant movement japanese quartz chronograph yes mpn f 91wc 3aef guarantee casio 2 year guarantee