Ready with smart phone linking, this g-shock mudmaster analog/digital watch from casio is designed for hard work and play. 52. 1mm black ion-plated stainless steel and green carbon core guard case the face is illuminated by a double led light and protected by a sapphire crystal to ensure high visibility solar-powered with special vibration-resistant construction that stands up to heavy wear triple sensor capabilities provide instant access to direction, barometric pressure and temperature information bio-based green resin strap with buckle clasp water-resistant to 200 meters