Single Line 2554 Classic Wall Phone, Black PLEASE READ AND VIEW PHOTOS: PLEASE DO NOT BUY IT IF YOU DO NOT HAVE A WALL MOUNT JACK IN YOUR HOME OR FACILITY. Phone hangs perfectly and sits nicely on the Wall Mount Jack. It will mount simply on your existing wall with a Wall Mount Jack Unit. Otherwise, you will not make this phone work SINGLE GONG, Traditional Bell Sound Ringer is loud enough to be heard almost anywhere within your house or business. (RINGER CANNOT BE ADJUSTED OR TURNED OFF) HIGH QUALITY CONSTRUCTION, Metal base and back panel with slotted holes for mounting, keypad with raised buttons for easily dialing, polycarbonate hook switch. Includes a 5 Year Limited Manufacturer Protection ONE VOICE PORT, Crystal clear voice quality w/ tone dial. Handset includes a volume control switch with 3 levels (low, normal, and high) DESIGNED FOR USE BEHIND ANY REGISTERED PBX SYSTEM, Station port type must be an industry standard analog, or POTS (Plain old telephone service). Cannot be used with digital PBX station ports. Includes Wall Unit (0 to 9 dialing keys), Hearing-Aid Compatible Handset, RJ11 Coiled Handset Cord (stretchable up to 7 feet), and a simple step by step User Guide