Unused item!! Citizen Promaster Eco-Drive Chronograph C660-S067634 Yacht Master W.R20BAR Made in Japan. Instruction manual included. This watch runs by converting light into electrical energy. It's an eco-friendly watch that doesn't use disposable batteries. It's the first watch to be certified with the "Eco Mark"!! I bought it two years ago and tried it on my wrist a few times, but I've never worn it outside.