100% AUTHENTIC Black Dial Men's WATCH AT0910-51E Make every day memorable with this crisp Citizen mens watch! ; Using the most advanced technology in watch making, the Eco-Drive never needs a battery. Citizens Eco-Drive technology harnesses the power of light (natural or artificial) and converts it into energy which is stored in a permanently rechargeable lithium-ion cell. Recharges continuously and has a power reserve that lasts from 6 months to 5 years (depends on model). Quick start up after exposure to light. Packaging: Official Citizen presentation box Guarantee: Official Citizen 5 year guarantee Case width: 34mm Case depth: 11mm Dial Color: Black Metal: Stainless Steel Strap type: Metal bracelet - free sizing available Strap color: Silver Water resistant: Water resistant Clasp type: Push-button Deployment