EXELTECH offers many options such as: Option (08) Low Idle Current Drain- A ferrite bar across the inductor to aid in reducing power draw when the unit is on but under no load. Option (07) Conformal Coating- Which protects the cicuit board in high humidity or airborne contaminant environments. For details on all available options Contact Us - N+1 Redundant - Expandable - Remote Switching - True Sine Wave - "HOT" Insertable - 1000 Watt Modules - Remote Metering - Adjustable Power