Initially Pairing the ACS10

The headset will automatically enter the phone pairing mode when you
initially turn on the headset or in the following situation:
• Rebooting after executing Factory Reset
1. Press and hold the Center Button and the (+) Button for 1 second.

2. Select ACS10 in the list of Bluetooth
    devices detected. If your mobile
    phone asks for a PIN, enter 0000.