Full-wave Built-in Rectification Bridge. Increased Voltage Output When Loading. Even Output Voltage With Negative Voltage. Protection from Short Circuit, Over Voltage and Over Current. Adjustable Output Range from 160V-260V For 240V Output. Ultimate Output: DC 90V 3.5A. Frequency: 50-60Hz, AC Voltage Output: 120V 240V, Ultimate Temperature: 130C - 266F, Continued Working: 20 Hours, Center Installation Distance: About 5.5 in.