Model: k856g movement: imported mechanical movement case: fully polished export standard fine steel strap: fine steel strap mirror: synthetic sapphire mirror 39.mm case diameter 10.0mm case thickness 50.0m waterproof depth.Butterfly double button fashion refined steel butterfly watch buckle, the buckle teeth are firm and durable, and the two-way opening buckle is simple to operate, convenient to wear and take off, making the watch strap more firm and caring for the watch.