Interesting device.
Follow Me is a small sensor-laden device which sits on your upper back, keeping an eye on your posture. A curved spine will immediately result in a notification being sent to your phone.
Additionally, the device keeps track of your daily step count; and has an hourly stand reminder (many smartwatch owners will already be intimately familiar with both of these). It'll be interesting to see if they add more of these fitness-centric features over time.
For now, a little video :