Cordless Handset, 46M/49MHz frequency... Cordless HandsetFSK/DTMF Dual System, Caller ID 15 Ringtones and Ringer Volume Selectable Blue Backlit LCD Display for the Portable Handset 50 groups Call-in Numbers Stored, Review, Dialed-Back 10 groups Dial-out Numbers Stored, Review, Dialed-Back 10 groups Fast-Dialing Numbers Memories Function