Keywords: Audikast, TC418, not pair, Bluetooth headphone, speaker
The MOST common causes are:
Cause 1: Audikast did not enter PAIRING MODE.
Solution: Enter Audikast into pairing mode - After power up and turn on Audikast, press and hold A for 1 second to enter into pairing mode, 
close to A flashes RED and BLUE alternately.
Cause 2: Your Bluetooth headphone/speaker did not enter PAIRING MODE.
Solution: Enter your Bluetooth headphone/speaker into pairing mode - please refer to relevant user manual, usually LED on Bluetooth headphone flashes RED and BLUE alternately or flashes BLUE quickly).
Cause 3: Your Bluetooth headphone/speaker or Audikast is connected to other unwanted Bluetooth device;
Cause 4: Affected by around wireless devices, e.g. wifi router.
Solution for Cause 3 & 4：Turn off all other around Bluetooth devices and keep the Audikast away from wifi router, then follow below steps to pair the Audikast and your Bluetooth headphone/speaker again:
Step 1: Reset/clear paired history of the Audikast, then the Audikast will enter PAIRING MODE automatically, close to A flashes RED and BLUE alternately.
Step 2: Reset/clear paired history of your Bluetooth headphone/speaker - refer to its user manual.
Step 3：Enter your Bluetooth headphone/speaker into PAIRING MODE - refer to its user manual, usually LED on Bluetooth headphone flashes RED and BLUE alternately or flashes BLUE quickly.
Step 4: Keep them close and wait for connect. Once connected, close to A turn SOLID BLUE.
NOTES:
If any more help needed, you may contact support@avantree.com for help. Also, to make sure all our users can use Avantree products properly, we offer Avantree Online Clinic to help you with your set up / installation FREE of Charge, click below link for details:
https://support.avantree.com/hc/en-us/articles/360000179026
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