Citizen Eco-Drive is Powered by Light</br>Mineral Crystal</br>Japanese-quartz Movement</br>Case Diameter: 43mm</br>Water Resistant To 660 Feet</br></br>Product Description</br></br>PROFESSIONAL DIVER: Proof that a dive watch can be fun & functional with the Citizen¨ ISO-compliant Promaster Professional Diver. With Eco-Drive technology, it is powered by light and never needs a battery, so you'll never need to open your case back making sure your watch maintains it factory sealed and water resistant.</br><br/>http://www.amazon.com/gp/product/B016R90VBK