The Online Indicator Light from Plantronics is compatible with all Plantronics wireless headset systems, such as the CS70N, CS50, CS55, SupraPlus Wireless, and Voyager Legend CD Bluetooth Headset System.
The Online Indicator Light becomes illuminated when you’re on the phone in order to alert others that you’re occupied.
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Sennheiser SC 30 USB ML Monaural Headset (504546) 


