The B-UPR series features unsurpassed reliability for regions or countries with chronic voltage problems. Designed to work and protect PC equipment in extremely hostile power environments where other UPS simply will not operate. An extra wide AVR conserves battery for added security. Includes and advanced multi-stage surge supressor that protects from surges and spikes via AC input fax or DSL lines. These powerful units include auto diagnostics such as load sensing. Sleep/green mode, audible and visual warnings that alert user of power and ups conditions. A high performance line interactive ups for value conscious users. Available with PC interface via RS-232 or USB