Model No. T137.463.11.050.00 is powered by a Swiss quartz movement (Caliber DGT‑2040, 13ʹʹ) using a Maxell CR 2025 battery, and it includes an EOL (end-of-life) battery indicator. https://saicreationswatches.com/products/t1374631105000-t-classic-prx-digital-watch-for-men