Last Number Redial Flash 100-300-600mS Message Waiting Lamp 90 Voltage Handset Volume Control Hook Delay Positive Line Disconnect A-Lead Data Jack Hearing Aid Compatible Hold with LED Indicator Flip-Flop Type Desk / Wall Mountable Customized Faceplate Available 10 One-Touch Programming Memory Mute with LED Indicator Flip-Flop Type Hands-Free Speakerphone w/LED Indicator Headset Control Switch Tone/Pulse Switchable-Black