Color: Black | Size: Large (6.3-7.8 in) Train smarter and go farther with Surge--a sleek_ fitness super watch designed to help you reach your peak performance. With built-in GPS_ multisport functionality_ and automatic_ continuous heart rate_ Surge delivers the stats you need to measure your effort and maximize your training time. Add activity tracking_ automatic sleep detection_ music control_ and text and call notifications_ and you have everything you need to stay connected_ motivated and in the zone--no matter what goal you're working toward.