Citizen Men's AT4027-06E Perpetual Chrono A-T Limited Edition Eco-Drive Limited Edition Perpetual Chrono A-T Watch Eco-drive, fueled by light Black ion plated stainless steel case with combination stainless steel/polyurethane strap Atomic timekeeping - the most accurate watch in the world Non-reflective sapphire glass Water resistant to 660 feet (200 M): suitable for recreational scuba diving