Panasonic KX-TGA740B Extra Handset for 64XX Series Cordless Phone, Black Extra Handset for KX-TG6444T, KX-TG6445T, KX-TG6473PK, KX-TG6434PK, KX-TG6442T, KX-TG6432M, KX-TG6440PK, KX-TG6444PK, KX-TG6441T, KX-TG7431B, KX-TG7432B, KX-TG7433B, KX-TG7434B Works with single line phones, Talking Caller ID, Silent Mode Cordless Handset Answering system not included Requires main phone to operate