T9 gear junkie here. I've tried every tech tracker and watch we've sold, and this one is the ultimate data gateway drug. Run-ready right out of the box, the Gateway is both a GPS watch and all-day fitness tracker—yup, tracking includes 24/7 optical heart rate and sleep (or lack thereof). Nitty gritty: tracks steps, calories, distance, sleep and intensity minutes, 24/7 heart rate monitoring. Rechargeable. Lasts up to 9 days as a watch, 13 hours in GPS mode. Water resistant up to 50m. Face: 1.5"x1.25".