Panasonic KX-TGA571S 5.8GHz FHSS GigaRange Expandable Digital Cordless Handset with 1.5" Full-Color Backlit LCD for KX-TG5761, KX-TG5766, KX-TG5767, KX-TG5771, KX-TG5776, KX-TG5777 and KX-TG5779S 5.8 GHz 1.5" color LCD Accessory Handset (needs the main system to work) FHSS GigaRange