Panasonic KX-TGA410B Extra Handset for KX-TG76XX Cordless Phones Series Additional Handset for: KX-TG7644M, KX-TG7642M, KX-TG7622B, KX-TG7645M, KX-TG7623B, KX-TG7643M Works with Single Line Phones Cordless Handset All Digital Answering System NOT Included Requires main phone unit to operate