As wind shifts, water conditions change or passengers move about, the Automatic Leveling Control (ALC) will automatically adjust your trim tabs to maintain a level boat for a more comfortable and enjoyable ride. These are a short ram systemThe ALC automatically corrects the roll from side to side and pitch from fore to aft to enhance your boating experience and improve your fuel economy.Microprocessor based automatic leveling trim tab control with LED tab position indicatorsControls roll and pitch automaticallyInternal GPS - no GPS antenna or network requiredAutomatically adapts to varying sea conditionsCompletely sealed and waterproof (IP68)UV protected - will not deteriorate in sunlightPrevents automatic corrections while turningDesigned for planing and semi displacement hulls larger than 20ftActuators connect directly to ALC-1 display panel (no external power module box required)Automatically dims LED tab position indicators in darkness and brightens in sunlightAutomatically retracts trim tabs when boat is off plane or using optional key switch connectionDual station operation available (ALC-1D and ALC-2D does require external power module)Operates on 10 to 30 Volts DC2 Year WarrantyCE Approved (Compliance with EMC regulations)