The VPVT-4PB is vandal proof intercom station withstand damage caused from abuse, moisture, corrosion, dust, vibration and temperature extremes from 150° to -30°F. Station is available in 15 watt model with 12-gauge stainless steel plate mounted to the high efficiency VT Series compression driver. Patented 8 ohm driver with water-sealed die cast zinc housing and exponential sound projector is recognized for dependable performance and high intelligibility voice and signal transmission. Driver functions as a loudspeaker and a microphone for hands-free remote station communication with a centrally located master control. Station assemblies install with tamperproof, button-head breakaway screws to a recess mounting enclosure (order separately). VPVT-PB is 7 1/4"SQ (184mm) and mount to enclosure Model VP-77 size 5 1/2"W x 6 1/4"H x 3 1/2"D (159 x 140 x 90mm). The enclosure is 16-gauge CRS with a rust preventive coating. VPB-1A is a vandal resistant push switch intercom accessory mounted to a single gang size 12-gauge stainless steel plate. Vandal proof hardware installs using a 6–32 holt-head driver bit for a standard 1/4" nut driver.