How do I put the unit in discover mode - Plantronics 510 Voyager Headset - PLN-510 Headset

Putting the Plantronics Voyager 510 into pairing mode:

With headset on, press and hold the call button and the volume up simultaneously until the headset begins to flash red and blue.

Select the Plantronics 510 headset in your phone when prompted and enter 0000 (4 zeros) as the PIN/passcode if prompted. When paired, the Voyager 510 headset should now have a continuous blinking blue light. Here is a link below for the step by step pairing instructions.

http://www.headsetsdirect.com/plantronics-voyager-510-bluetooth-pairing-instructions

Good luck from Headsets Direct - 800-914-7996.