How do I Reset my CS50/CS55, CS70/CS70N Microphone?

Here's how to reset a microphone on one of the older Plantronics wireless headsets (all now discontinued):

This procedure is performed with the headset out of the base.

1. Press the silver middle button and both the (+) and (-) volume buttons on the microphone for 5 seconds.
2. When the orange or white talk indicator light in the middle of the headset blinks, release all the buttons.
3. Press the silver middle button on the headset. The orange talk indicator light will blink briefly to indicate the headset is back to normal operation mode.
4. Disconnect the power adapter from the base for 5 seconds.
5. Reconnect the power cable.
6. Test out your headset!