Features: Stainless Steel Case Synthetic Rubber Strap Eco-Drive (recharged by any light source, no need to change battery) Caliber H145 Sapphire Glass Made In Japan Black Dial Date Display Insufficient Charge Warning Function Overcharge Prevention Function Perpetual Calendar Power Reserve Indicator Power Saving Function Radio-Controlled UTC (Universal Time Coordinated) World Time 200 Meter Water Resistant Case Diameter :44mm Case Thickness :11mm