Corded office headset
The corded USB version of the Evolve2 55, with the same active noise cancelling plus a Bluetooth link to a phone. It has no battery, so it works only while plugged into a computer.
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USB cable plus Bluetooth
A USB-A or USB-C cable connects it to the computer, and Bluetooth links a phone at the same time, so you can take calls from either.
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Active noise cancelling
Both the mono and stereo versions have active noise cancelling, using two dedicated noise-cancelling microphones.
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360° busylight
A busylight visible from all sides turns on automatically during calls.