VLH-3000A 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom StationsFeatures: 30W PA/Hailer output with Listen Back Dual Zone - Forward, Aft or Both 6 Preprogrammed Fog Signals: Underway, Stop, Sail, Tow, Anchor and Aground Horn and Siren Noise canceling microphone with dedicated CALL, IC1 and IC2 keys Compatible with MLS-300 and MLS-310 (10W amplified) external audio speakers Compatible with optional MLS-300i intercom speaker with Push-to Alert button for IC1 and IC2 Flush Mount capable with optional MMB-84 Adjustable Backlight 3 Year Waterproof Warranty Specifications: Auto Signaling: Yes Hailer Wattage: 30w Intercom Capability: Yes Listen-Back: Yes Box Dimensions: 6"H x 10"W x 15"L WT: 5.6 lbs UPC: 788026155002