Vandal Resistant Features: 12 gauge (0.105" thick) 316 stainless steel panel with permanent laser etched graphics Armored handset cable Metal cradle Heavy duty metal keypad Hex drive mounting screws Weather Resistant Features: Marine grade 316 stainless steel faceplate Marine grade 316 stainless steel screws Internally sealed keypad Auto dials one programmable speed dial number (up to 32 digits) Multi-number dialer mode adds 5 speed dial numbers (up to 16 digits) Touch tone or pulse dialing Non-volatile memory, no batteries required Operates on analog PABX and key system extensions or analog Centrex and CO lines Programmable 6 digit security code Touch tone programmable Armored 12" handset cable with an internal stainless steel lanyard for additional cable strength Programmable pre-dial pause Blocks fraudulent calls from hand held pocket dialers Limited toll restriction in standard touch tone phone mode Hearing aid compatible amplified handset with sealed push button volume control Programmable default volume level Programmable volume control disable Zinc plated steel rough-in box with (2) 0.75" conduit knockouts included Flush mount using the included rough-in box or surface mount using a Viking VE-5×10 surface mount box (not included, DOD 424)