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Surface audio entry kit based on the Vandal Resistant 4000 Series modular design incorporating two way speech, electronic call tone and lock release facility. 1 button kit with call progress LED’s in a VR 12 gauge stainless steel finish (2.5mm thick). Kit also includes an 8-12VDC/13VAC PSU (520M) and wall mount 2 button 3111 audiophone with 3 level call tone switch.