VOYAGER 500A EAR PIECE IS FLASHING RED - Plantronics Voyager 500A Deskphone Adapter for Voyager Series Bluetooth Headset [ Pla... Headset

SOURCE: Plantronics Voyager 500a Bluetooth Headset

Try re-syncing the headset to the base unit:

http://plantronics.custhelp.com/cgi-bin/plantronics.cfg/php/enduser/std_adp.php?p_faqid=8165&p_created=1128461658

SOURCE: I lost my ear piece

1. On the base, press and hold both speak volume fine adjust buttons until the blue talk/on line indicator light and red power indicator light (on the front of unit) start to flash.
2. On the headset, press and hold the listen volume adjust + button and call control button until the status indicator flashes red and blue.
3. Pairing is complete when the talk/on line indicator on base illuminates solidly, and the status indicator light on headset flashes blue.

Important: Make sure your headset is not connected to any other Bluetooth device when attempting to pair.

Good luck from Headsets Direct!