Additional Details ------------------------------ Product description: 12 lines, twenty-four programmable buttons Talking Caller ID feature You must have a Caller ID module in your phone system control unit, and have Caller ID service from your local phone company for the Talking Caller ID to work. Works with Panasonic KX-TA624-4 or higher, KX-TA1232-2 or higher, KX-TAW848, KX-TA824, KX-TDA50, 100, 200 phone systems