4 Line Phone System Bundle, 2 Additional Cordless HandsetsEasy to set up. Plug the Motorola base station into any phone jack and wirelessly connect desk phones and handsets. You can wirelessly expand up to 10 , phones and it supports up to up to four phone lines. Also features full duplex speakerphone along with six way conferencing. The phone system bundle also features auto attendant digital receptionist, caller ID call waiting, call transfer, 99 name and number phonebook with 99 name and number caller ID