Time to unplug. The Eco-Drive Limited Edition Proximity requires zero wires, plugs for charging. Powered by light, the Eco-Drive Proximity, is a smarter watch for the tech-savvy consumer with bluetooth compatibility to iOS and Andriod. The Eco-Drive Proximity features a perpetual calendar chronograph, dual time, alarm, power reserve, light level indicator, time and date sync. Additional capabilities include phone search/filter and visual/vibration alerts. This model appears in a black polyurethane strap, black ion plated stainless steel case and black dial with vibrant green detailing. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number W770.