Panasonic DECT 6.0 Accessory Cordless Handset for KX-TG6411, KX-TG6412, KX-TG6413, KX-TG6423, KX-TG6431, KX-TG6432, KX-TG6433, KX-TG6434, KX-TG6435, KX-TG6438, KX-TG6439, KX-TG6440, KX-TG6441, KX-TG6442, KX-TG6443, KX-TG6444, KX-TG6445, KX-TG6449, KX-TG7431, KX-TG7432, KX-TG7433 and KX-TG7434 only.