AT&T CL4939 CL4939 Corded Phone with Digital Answering System ATTCL4939 ATT CL4939, Power-failure operation offers peace of mind during power outages. Large, tilt display and oversize buttons make it easy to make and receive calls. Audio Assist feature increases overall volume and enhances sound frequencies to make speech easier to understand. Fully integrated answering machine lets users screen calls and check message while away. Tri-lingual menus support easy interaction and user convenience. Compatiblewith most hearing aids. Answering System: Digital; Lines: 1; Telephone Type: Corded; Caller ID/Type: Standard Display., UPC 650530018978