VTech SN6127_-2 Manual - Manual (Page 17)

Getting started
11
Expand your telephone system
You can expand your telephone system by adding new handsets
( SN6107, purchased separately) and/or new portable pendants
( SN6166/SN6167, purchased separately). The telephone base can
support up to 12 devices. Each device must be registered to the
telephone base before use.
The handsets provided within your product package are already
registered as HANDSET 1 and so forth. Additional handsets are
assigned numbers in the sequential order.
To add and register a new pendant, see the user’s manual that come
with your new pendant.