The Woman's Citizen FC0010-55D model with a Silver Stainless Steel case, water resistant to 100m (10 ATM), with matching Silver band. The Citizen watch has a Sapphire Glass. The Quartz (Solar Powered) movement is inside the 39mm diameter case and 10mm, this is comfortably sized for all wrists without looking massive, and feels comfortable and solid on the wrist. Citizen, a pioneer in watchmaking and innovative technology since 1918, promotes excellence and creativity with a deep-rooted respect for craftsmanship. An Eco-Drive watches recharges itself in any kind of light, to run forever. Watches with Eco-Drive do not require any battery replacement, charging or winding to maintain constant operation. The movement is radio controlled. The time is synced daily with the world time signals transmitted from around the globe.