Cortelco 7 series line powered caller ID telephone Requires no batteries or AC adaptor Caller ID with call waiting, 99 number caller ID memory Wide angle, adjustable, LCD display Voice mail indication FSK/90V/24V Mute with LED indicator Hold with LED indicator PBX hold programmable On hook pre dial Directory button save up to 99 names and numbers 5 One touch and 5 two touch speed dial memory locations with up to 24 digits Programmable flash Enhanced redial last 10 numbers Handset receive volume control 4 levels Programmable ring cadence 10 positions Programmable ring volume off through 7 Programmable VIP alert Data port Speakerphone Speakerphone volume control 8 levels DTMF dialing Programmable area code 2.5mm/RJ type headset jack Desk/wall mountabler