I like the chair very much and especially the head rest adjust. The chair does not come with a battery back-up but that is easily solved with a UPS unit. Sizing can be accomplished by using the 2amp by 29 volt and multiplying same to get wattage requirement of about 60 watts. I'm running phone, tablet, hotspot and chair so I selected a larger unit of 850VA by APC but a unit half that size would due nicely as will a modified sign wave unit.
Battery backup work around
I like the chair very much and especially the head rest adjust. The chair does not come with a battery back-up but that is easily solved with a UPS unit. Sizing can be accomplished by using the 2amp by 29 volt and multiplying same to get wattage requirement of about 60 watts. I'm running phone, tablet, hotspot and chair so I selected a larger unit of 850VA by APC but a unit half that size would due nicely as will a modified sign wave unit.