While the headset and dongle will come paired together in the packaging, it is possible they might lose their pairing, or you may get a replacement dongle and have to pair it with a headset for the first time. In most cases, re-pairing can be done by first turning off the headset and pressing and holding the transmitter pairing button on the dongle for a few seconds until it starts blinking rapidly. Then turn on the headset by pressing its power button for 6 seconds.