Vandal Resistant Features: 14 gauge louvered 316 stainless steel faceplate with permanent laser etched graphics, speaker/mic screen, heavy duty metal In.CallIn. button and T-10 Torx security mounting screws- Weather Resistant Features: Marine grade 316 stainless steel faceplate, screws and push button switch. Switch internally sealed per IP67. Mylar speaker. Self-draining mic mount.Faceplate, mic and speaker gaskets. Weather resistant powder paint on optional VE-5×5 DOD# 424- Volume adjustments for microphone and speaker- Two watt amplifier to drive speaker- Power supply included- Blue LED indicator- Extended temperature range -15 Degrees F to 130 Degrees F- Optional VE-5×5 surface mount back box DOD# 424- Optional MSB-30-EWP is designed to meet IP66 Ingress Protection Rating see DOD# 859 for more information