i bought two of these small 350VA units brand new several months ago for $20 (not Woot or Amazon). Not a ridiculous $44 for a reconditioned unit. Both were defective. One wouldn’t even power on, the other had the alarm ring constantly. Company was good about providing postage paid return. Both replacements arrived and were defective as well. Didn’t provide battery standby at rated spec. Returned once more and one of two replacements was still defective. Finally on third try got replacement for second unit that worked as described. Other sized units from same company have served me well. With the amount of problems these two small units gave I would not recommend them. Not even at the $20 I paid.