VLH-3000A 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom StationsFeatures:30W PA/Hailer output with Listen BackDual Zone - Forward, Aft or Both6 Preprogrammed Fog Signals: Underway, Stop, Sail, Tow, Anchor and AgroundHorn and SirenNoise canceling microphone with dedicated CALL, IC1 and IC2 keysCompatible with MLS-300 and MLS-310 (10W amplified) external audio speakersCompatible with optional MLS-300i intercom speaker with Push-to Alert button for IC1 and IC2Flush Mount capable with optional MMB-84Adjustable Backlight3 Year Waterproof Warranty