My Black Card is not buzzing
First check to make sure that the Blackcard is fully charged. When you push the button on the blackcard is should beep and lights up.
Why does my BlackCard blink, but not buzz?
If you are trying to buzz your Blackcard and it is lighting up but not buzzing, you could have a defective buzzer. Please contact firstname.lastname@example.org and we will troubleshoot to see if you need a warranty replacement.