Best way to charge Senstone is with clip or pendant on. Then you plug the dock station into USB power source and simply put Senstone on top. A built-in magnet will help place it correctly.
We identified charging issue with some units from the first batch. When it charges it can periodically stop flashing. If this happens then find the right position (turn Senstone on the charge or press a bit). After charging it ~20 times it should work fine. If the problem persists -- contact us at email@example.com.