The Sunvolt solar-powered chronograph comes with a dial made from genuine grey marble and a case crafted from maple wood and stainless steel in antique silver. This exclusive model is limited to 300 pieces only, each with a unique engraved serial number on the caseback. Sunvolt is solar-powered so changing batteries is a thing of the past. The charge indicator will let you know when it’s time to get out in the sunshine again!