Viking Electronics K 1900 8 Vandal Resistant Hot Line Panel Phone Diesel Mute Control Category_Targets Mute Control Due To The Strong Tapered Blade DesignS And Angle It Allows The Montec To Be Easily Re Sharpened Auto dial 1 (up to 32 digits) programmable speed dial number Multi number dialer mode adds 5 (up to 16 digits) speed dial numbers Touch tone or pulse dialing Non volatile memory (no batteries required) Operates on analog PABX and key system extentions or analog Centrex and C lines Programmable 6 digit security code Touch tone programmable Vandal resistant Programmable pre dial pause Blocks fraudulent calls from hand held pocket dialers Limited toll restriction Hearing aid compatible amplified handset with sealed push button volume control