You may need to reset the CK210 if it is not working as expected. When reset to its factory default setttings. all the paired device information will be cleared.
Step1: Set the CK210 into PAIRING MODE - press and hold the MFB for 3 seconds until the LED flashes BlUE and RED alternately.
Step2: Double click the MFB - the BlUE and RED LEDs will turn on for 1 second to indicate a sucessful reset. Then it will automatically enter pairing mode.