It isn’t essentially the most intuitive design to use, nevertheless it will get the job carried out. Given that one on/off button on top doubles as all the indicator lights for the device, you may must resort into the manual (or this manual) to determine what the UPS is attempting https://claytonkhdyt.glifeblog.com/35156680/5-tips-about-ups-battery-backup-calculator-you-can-use-today