Interactive UPS Model: S600B (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection [ specifications ] Model: S600E (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection Rups 2000 UPS software bundle Auto Shut-Down [ specifications ] Model: S600L (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection Rups 2000 UPS software bundle Back-Up Time: 30 mins - 8 hrs [ specifications ] Model: S1200P (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection Rups 2000 UPS software bundle Auto Shut-Down [ specifications ] Model: S1200L (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection Rups 2000 UPS software bundle Auto Shut-Down [ specifications ] Model: Superior IR2000S (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection Rups 2000 UPS software bundle [ specifications ] Model: Superior IR3000S (PowerTree) 100% Stabilised Output Power 100% Back Up Guarantee Overload & Short Circuit Protection EMI / RFI & Powerline Noise Protection Rups 2000 UPS software bundle [ specifications ]