Panasonic KX-TGA270S 2.4GHz Extension Cordless Phone (Handset Only) For KX-TG2700S, KX-TG2730S, KX-TG2720S, and KX-TG2740S models 2.4 GHz frequency-hopping digital spread spectrum (FHSS) technology Caller ID with call waiting, 50-station memory 2-way intercom and paging Wall mountable