The G1707 (GA‑B2100BBR‑1ADR) is powered by Tough Solar (solar charging) and offers Bluetooth® connectivity via the CASIO WATCHES app, enabling automatic time updates, easy setting configuration, world time access, reminders, phone finder, and more. https://saicreationswatches.com/products/casio-g-shock-ga-b2100bbr-1adr-g1707-analog-digital-unisex-watch