Sennheiser DW Series Manual

How to connect your Sennheiser DW office to your desk phone via the
headset socket or with a lifter.
Headset socket setup:
Step 1: plug in your power supply to power up the headset docking cube.

Sennheiser DW Series Specifications

General

GAP Compatibility	Yes
Type	Wireless
Talk Time	Up to 12 hours
Microphone	Noise-canceling
Wearing Style	Over-the-head
Earpads	Leatherette