Standard Horizon 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom Stations. VLH-3000A 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom Stations Specifications for Standard Horizon VLH-3000A 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom Stations: Manufacturer: Standard Horizon Color: Black Features of Standard Horizon VLH-3000A 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom Stations 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 Package Contents: Standard Horizon VLH-3000A 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom Stations Standard Horizon VLH-3000A: 30W Dual Zone PA/Loud Hailer/Fog w/Listen Back & 2 Optional Intercom Stations VLH-3000A