In order to charge your Activity Tracker, use your mobile device's USB charger. Those chargers consist of 2 parts, a wall unit and a cable. Remove the cable from the wall unit and follow these steps. 

1) On the tracker, remove the wristband that has the holes in it. 

2) Plug tracker into the USB charging unit. The display on the tracker will turn ON (it can take up to 10 seconds for the display to come ON). If the display does not turn ON, turn the tracker around and plug it in the other way.