Additional Features: Auto Dials One (up to 32 Digits) Programmable Speed Dial NumberMulti-Number Dialer Mode Adds 5 Speed Dial Numbers (up to 16 Digits)Touch Tone or Pulse DialingNon-Volatile Memory (no Batteries Required) Operates on Analog Pabx and Key System Extensions or Analog Centrex and C.O. Lines Programmable 6 Digit Security CodeTouch Tone Programmable Vandal Resistant Features: 0.105 Thick 316 Stainless Steel Panel with Permanent Laser Etched Graphics, Armored Cable, Metal Cradle, Heavy Duty Metal Keypad, and Hex Drive Mounting Screws Weather Resistant Features: Marine Grade 316 Stainless Steel Faceplate and Screws, Sealed Keypad, Weather Resistant Powder Paint on Optional Ve-5x10 (DOD 424).K-1900-8-Ewp is Designed to Meet Ip66 Ingress Protection Rating (see Dod 859)36 Armored Handset Cable on Standard Model, 54 on Ewp Model Programmable Pre-Dial Pause Blocks Fraudulent Calls From Hand Held Pocket Dialers Limited Toll Restriction In Dumb Phone ModeHearing Aid Compatible Amplified Handset with Sealed Push Button Volume Control Programmable Default Volume Level Programmable Volume Control Disable