Item Number BL5497-85W Caliber No. E820 power photovoltaic eco-drive accuracy ±15 seconds/month duration Photovoltaic power generation 2 years (when power save is activated) weight 131g Thickness 11.1mm case size Width 39.5mm case material stainless Case surface treatment Plating (gray color) Band material/type Stainless steel tri-fold push type Bandwidth 20.0mm band adjustable size 138-208mm glass spherical crystal glass Waterproof performance 10 ATM water resistant Design features Luminous (needle + index) function Charge warning function Overcharge prevention function Power save function