The men's casio g-shock mudmaster was created especially for those whose work takes them into rough and dirty areas. Black dial, luminous hands and markers, yellow and red accents, digital display, double led light 52. 0mm black resin case with sapphire crystal the carbon fiber core guard structure, resin case material, and metal button create a tough-wear mud and shock-resistant design triple sensor capabilities provide instant access to direction, barometric pressure, and temperature with bluetoothâ® technology, this style links to your smartphone for more features japanese quartz and digital movement; tough solar power recharges the battery black resin strap; buckle clasp water resistant to 200 meters we are an authorized casio dealer