You may need to reset the CK11 if it is not working as expected. When reset to its factory default settings, all the paired device information will be erased.
Step 1 Set the CK11 to PAIRING MODE – press and hold the MFB for 3 second until the LED flashes BLUE and RED alternately.
Step 2 Double click the mute button – you will hear 2 beeps indicating a successful reset. Then it will automatically enter pairing mode.