The X2-CB is equipped with an onboard buzzer to provide system status feedback to the user.

X2-CB Buzzer Indicator Status Lookup
EventBeep TypeStatus
When power is appliedShort beepSystem boot successful
During telemetry connectionTwo short beepsConnection successfully established
During telemetry connectionThree short beepsNo signal/connection failed
During Autodetect3 second beepAutodetect completed successfully