The Ultra 2000VA offers an incredible array of features and benefits including line interactive design, AVR (auto voltage regulations), USB communication port, alarms for battery backup, low battery and overload, energy saving function (UPS green mode), automatic charging when UPS is off and much more. This outstanding unit protects up to four devices simultaneously and is fully digitized microprocessor controlled. For the ultimate protection at a minimal cost - choose the Ultra 2000VA power protection unit.