Model No. T137.263.33.020.00 runs on a Swiss quartz digital movement (ETA DGT‑2040 / Caliber 13’’’), powered by a Maxell CR 2025 battery, featuring an EOL (end-of-life) battery indicator and several digital functions https://saicreationswatches.com/products/t1372633302000-t-classic-prx-digital-unisex-watch