VPVT-4PB Series vandal proof speaker station withstand damage caused from abuse, moisture, corrosion, dust, vibration and temperature extremes from 150° to -30°F. Station is available in 15W 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 speaker 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.