24/7 activity tracking with activity goal, activity time, steps and distance and inactivity alerts. Monitors your sleep duration and quality. Can measure heart rate and monitor smart calories when worn with a Polar H7 heart sensor. The energy pointer function visually shows you what the main effect of your training is. Provides vibrating smart notifications. Polar H7 Heart Sensor NOT included. The polar loop 2 is a stylish unisex activity tracker that can be custom fit to all wrist sizes. Featuring 24/7 activity tracking with activity goal, activity time, steps and distance and inactivity alerts. W20, . Weight 38g.