Sometimes, Lock will not work properly. Please try to reset them first.
1. Under power on status, press and hold pairing button for about 5 secs, until you see LED flashes BLUE and RED alternately.
2. Double click pairing button, LED lights on BLUE and RED simultaneously (like PINK) for about 2 secs. It will re-enter pairing mode again.
3. Wait for pairing with each other successfully. (How to judge if success or not)