A sound card used to expand audio capabilities.

The main unit has built in DISA(Direct Inward System Access) that supports one audio channel and 180 seconds of message record time. 

The KX-TA82491 adds a second audio channel and an additional 180 seconds for a maximum total of 2 audio channels and 360 seconds. A maximum of 1 KX-TA82491 can be installed in the system.