Letsfit IW4 Smart Watch is here to take your fitness to a higher level. Intended for a wide variety of users of all ages who want to be more conscious of their health with an approachable interface that will have you off and running in no time. With the IW4, all your necessary vitals are recorded and available including step/distance monitoring, activity/sports tracking, sleep analysis, heart rate monitoring, calories burned, and SpO2 blood oxygen measurements.