Medisana-Activity-&-Sleep-Trackers-Medisana-79410-p-The-Vi Fit-activity-tracker-will-precisely-monitor-all-daily-&-nightly-physical-activity-as-well-as-the-duration-&-quality-of-sleep-The-monitor-is-small-enough-to-be-carried-in-a-pocket-or-can-be-worn-on-the-wrist-using-the-supplied-wristb&-In-activity-mode-the-device-will-track-steps-distance-covered-calories-burned-activity-time-&-percentage-of-daily-target-The-highly-sensitive-3D-motion-sensor-reacts-to-steps-&-not-vibra