State-of Art auto load sense. Standard inbuilt low battery cut-off. Great overload performance. Very efficient stand by circuit. Do not effect other equipment like TV, radio?etc. No problem with microwave ovens. Extremely efficient. Standard specially designed AC- and DC ? line filters. Built-in standard RS232 interface. No moving parts. No noise. No smell. Can be used anywhere including National Parks. Compact. Simplified system design. Aluminum chassis for harsh environments. Easily mounted. Lowest installation cost. Reliable No moving parts. No noise. No smell.