"Sturdy heavy gauge stainless steel flush mount or surface mount telephone for standard keypad dialing. Phone is built with a (-ACH18)18in. hearing aid compatible armored cord handset marine quality chrome keypad and (-M) magnetic hookswitch completely sealed with no moving parts (-IVC) push button volume control with background noise reduction advertising or instruction window tamper resistant security screws and flush mount steel rough in mounting box. Security Rool required 301-037 - Sold Separately."