About this product Oozing both style and comfort, the Citizen Mens Eco-Drive watch fits snugly on your wrist with its luxurious green military strap. The alluringly luminous hands stand out expertly on the classy black dial to finish off a great looking product. It's even water resistant to 100m, making it ideal for daily usage. A simple, yet revolutionary concept: a watch that never needs a battery. Citizen Eco-Drive technology harnesses the power of light from any natural or artificial light source and converts it into energy which is stored in a permanently rechargeable lithium-ion cell.