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Installing the headset
To use the optional wired headset with your Avaya 4027, 4070, or 4075
DECT Handset, install it as shown in the following figure.
Note: (4075 only) The headset jack is covered by a protective plug.
Remove it before installing the headset.
Figure 21: Installing the headset
Removing and installing the battery pack
(4075 only)
Use the following steps to remove and install the battery pack and cover:
1. Place the handset face down on a flat surface.
2. Unlock the battery cover as shown in Figure 22.
3. Remove the battery compartment cover.
Headset
connector
Headset