How to Connect Two Mobile Devices Simultaneously to CK210
Step 1: Pair the First Device.
You can refer to THIS GUIDE to pair your first device to the CK210. After pairing the first device, turn off Bluetooth on that device.
Step 2: Put the CK210 into pairing mode again.
Press and hold the MFB until the LED flashes RED and BLUE again.
Step 3: Connect the Second Device.
Find "Avantree CK210" on the second device and connect to it.
Step 4: Reboot the CK210.
Turn Bluetooth on your first phone back on. Reboot the CK210 off and on again and both phones should reconnect to the device. If not, manually connect the phone by tapping on "Avantree CK210."