- SL1100 24-Button Full Duplex Tel (Black) - Digital 24 Button Black Proprietary Telephone - Backlit 3 line 24 character display - 2-Step adjustable angle - Programmable keys with red/green LEDs - Backlit dialpad - 4 Soft keys - 9 Fixed feature keys - Navigator key - Headset port - Full duplex speakerphone - 20 number personal directory - 1000 number system/group directory - Dual-color call indicator lamp - 8 Selectable ring tones - Power saving sleep mode - Do not disturb - Call forwarding - Mute - Flash - Hold - Headset jack - 9 Foot handset cord