Brains and brawn — you can count on this watch for rugged G-Shock toughness with smartphone connectivity. Access your smartphone GPS via Bluetooth for precision accelerometer measurement. Use your smartphone to take initial measurements of specific spans, then leave it to the timepiece to accurately measure these distances on its own. Get all the info you need — distance, speed, pace, and calories burned, as well as auto lap readings to keep track of running times for set distances. Download the app to control watch settings, manage workouts, and check activity history. Displays five stages of exercise intensity and tracks progress against the workout goals you set. Enjoy the clearest display yet with Memory in Pixel (MIP) LCD and Super Illuminator to ensure visibility even in the dark. Not just rugged and smart, but comfortable, too. The band is made of soft urethane for a quality fit.