Seiko Women's SUT038 Two-Tone Stainless Steel Solar Watch The caliber (V187) in model SUT038 uses a rechargeable ion cell that is designed for multiple charging and discharging cycles and it takes about eight hours of exposure to light of about 700 lux to get consistent and steady operation, and about 100 hours for a full charge; this caliber carries a two month charge once it is fully charged. Two-tone dress watch in stainless steel featuring round white dial with logo, date window at 3 o'clock, and link bracelet Solar-powered quartz movement with analog display Features push-button clasp closure, stick hour markers, and textured crown Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving