The citizen promaster sea men's watch is part of the unite with blue series, inspired by the beautiful oceans that unite the world. The pigment-free ink on the dial uses light – the same light that powers the eco-drive technology within – to reflect off the surface of the ink microstructures and create an array of aquatic shades. 46mm stainless steel case with easy-grip bezel and sapphire crystal the 100% recycled polycarbonate dial reflects the colors of the seven seas; date display and luminous hands and markers magnetic-resistant eco-drive is powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries black polyurethane strap; buckle clasp 300-meter water resistance