121000TP227S SL CID Business Tel. Mute with Indicator Desk/Wall Mountable 2.5 mm Headset Jack Speakerphone Caller ID/Call Waiting (Memory for 50 Calls) Wide Angel Adjustable LCD Voice Mail Indication (FSK/Stutter/90V/24V) On Hook Pre dial Directory Button (Save up to 99 Names & Numbers) Five One Touch/15 Two Touch Speed Dial Programmable Flash Time (100/120/300/600 mSec) Handset Receive Volume Control (8 Levels) Programmable Ring Cadence (5 Positions) Programmable Ring Volume (4 Levels/Off) Data Port Headset Button Release Button 7 10 11 Button Contrast Button Three Languages English/French/Spanish) Programmable Area Code Programmable LDS Code Programmable PBX Access Code Programmable VIP Alert Clock Call Timer 7.5V DC Adaptor