KX-TA82493 Caller ID
Allows Caller ID information to appear on the display of the proprietary analog telephones. Provides Call Waiting. One card required for every 3 lines. Caller ID service must be provided by phone company. One card comes built-in with the Panasonic KSU. Maximum of 2 additional cards can be added to your Panasonic phone system. KX-TA82493 only works with Panasonic phone systems.