Samsung Gear Circle
The module that goes behind your neck not only houses the charger port and charging circuitry, but also the rather large 180mAh battery (an X2 has 100mAh) and the vibration motor. The vibration is quite strong and will vibrate similar to a phone when receiving calls. This module sticks out like a sore thumb.
We can not guarantee that the information on this page is 100% correct.