Centrex or Multi-Line Compatible * Multiple access directory numbers (MADN) * class/CMS compatible *14 programmable line/feature keys *14 Programmable Line/Feature Keys * Headset Compatible * 2-Line x 24-Character LCD * Visual ringer * Supports two M522 Meridian Mate Expansion Units * AC Powered (Adapter Incl) * Power Feature * On-Hook Dialing * Hold/Release Keys * Message Waiting Indicator * Redial * Date/Time * Mute * Desk/Wall * Call Timer * Volume Control * Program Key