Features: 1) Compact design 2) Light, reliable, efficient 3) No waveform distortion 4) Easy to use 5) High performance Specifications: 1) Input voltage: 150 - 250V AC 2) Output voltage: 220V?% or 110V?% 3) Ambient temperature: -5 ~ 40癈 4) Output over-voltage protection: AC 248V?V 5) Power: 500VA 6) Applications: computers, testing equipment, lighting equipment, alarm and security systems, X-ray equipment, medical equipment, duplicators, broadcasting equipment, photographic processing equipment, numeric control machines and tools, industrial robots, laboratory instruments Packing: 4sets/box Box dimensions: 43.5 x 24 x 35cm N. W.: 5kg/set G. W.: 22kg