Cisco 8832 User Manual page 10

You can connect two wired expansion microphones to the phone to increase coverage in larger conference rooms.
Draft comment: Design team: This has been added for the Wireless Microphones feature.
The phone also supports an optional set of two wireless expansion microphones.
The Cisco IP Conference Phone 8832NR (non-radio) version does not support Wi-Fi or wireless expansion
microphones.
The phone can be used for a 20 x 20 foot (6.1 x 6.1 m) room and up to 10 people. When you add the expansion
microphones, coverage extends to a 20 x 34 foot (6.1 x 10 m) room and up to 22 people.
Draft comment: Design team: This has been added for the Daisy Chain feature.
You can connect two base units to increase the coverage for a room. This configuration requires the optional
Daisy Chain kit and can support two expansion microphones (either wired or wireless, but not a mixed
combination). If you are using wired microphones with the Daisy Chain kit, the configuration provides
coverage for a room up to 20 x 50 feet (6.1 x 15.2 m) and up to 38 people. If you are using wireless
microphones with the Daisy Chain kit, the configuration provides coverage for a room up to 20 x 57 feet (6.1
x 17.4 m) and up to 42 people.
You can use the information in the following sections to understand what has changed in the document.