(or pairing) a Plantronics bluetooth headset to another device a lot depends on the other device. Assuming that you
know the necessary steps of your phone or PC for connecting a bluetooth
device, all Plantronics headsets pretty much follow a set pairing
procedure for connectivity. This one is for the Discovery 975:
1 Turn on the Bluetooth feature on your phone.
2 Turn the earpiece on. Press and hold the call control button until the indicator flashes red/white.
3 Use the commands on your phone to locate and select your earpiece. 9xx Plantronics.
4 If prompted for the PIN code or Passkey, enter 0000.
Pairing is successful when the indicator on your earpiece flashes white.
Note If your phone supports Secure Simple Pairing (SSP), you will not need to enter a PIN code or Passkey.
Good luck from Headsets Direct