What are the LED lights on the In-line control of the USB Headsets (3064-USB, 3066-USB, and 4100-USB) for?
The USB Headsets feature three LED lights on the In-line control as easy-to-see indicators for the users. The bigger LED light at the base of the In-line control indicates headset power on/off; the top small LED light signifies microphone on/off; and the small LED light in the middle flashes when data is transmitting.