Description:? - Viking Economical And Vandal-Resistant Hot-Line Phone- Programmable 1- 32 Digit Telephone Number Each Time The Phone"s Handset Is Lifted- Products May Be Programmed To Touch Tone Or Pulse Dial And Will Not Dial On Incoming Calls- Available In Desk Or Wall Chassis, As Well As In A Vandal Resistant Panel Phone Configuration- Network Insert Dialer Also Available To Convert Standard Phones Into Hot-Line Phones- Telephone Line Powered- Hearing Aid Compatible Amplified Handsets- Rotar Handset Volume Control- 1 -32 Digit Speed Dial Number- Touch Tone And 10/20 Pps Pulse Dialing- Non-Volatile E2 Memory (No Batteries Required)- Restricts Fraudulent Calls From Hand Held Dialers- K-1900D/W-2 Available In Red Or Ash- Optional Q170600 Ringer (Fax Back Doc 845)- Operates On A Co Line Or Analog Pabx/Ksu Extensions- Ring Detection (Will Not Dial On Incoming Calls)- Programmable Security Code To Enter Programming Mode- Touch Tone Programmable K-1900-6 Fits Standard 500, 554, 2500 And 2554 - AshVkk1900w