Centrex OR Multi-line compatible * multiple access directory numbers and single call Arrangement(MADN SCA) * Class/CMS Compatible * Handsfree/Speakerphone for Multi-Tasking * 13 Programmable Line/Feature Keys * Volume Control * Redial * Compatible with M522 Meridian Mate Expansion Module * Headset Compatible * Speed Call * Mute * Call Timer * 2-Line x 24-Character LCD* Visual Ringer * Power Feature * AC Powered (Adapter Incl) * On-Hook Dialing * Message Waiting Indicator * Hold/Release Keys * Date/Time * Desk/Wall * Program Key