We have sporadic power outages (last year 3, in the 15 years before a total of 3), so I wanted to protect my NAS, however. With USB can be the thing loose clamping to Synology NAS devices and is instantly ready for use. The initial start-up is easy, if you follow a few rules: the back of the device is a jumper that looks like a car fuse, in fact it is only one of the circuit batteries closing connector. Which you have to push into the socket but with some well-intentioned belief. As an electronics one is accustomed dexterity, here you have to approach something tangible, so no false modesty when installing. Furthermore, you can by using the settings of an existing button (yes, it really goes :-)) the threshold still adapt. I live in a medium-sized city with 140,000 inhabitants and small fluctuations come quite in front, so that the device is responding 3 weeks twice to protect the components, although not interested in other electronic component in the budget for the variation. Therefore, I have asked the threshold of medium to low to generate less unnecessary switching operations.
Overall, the unit secures me a 8-Bay NAS, a 2-bay NAS, a switch, router and access point - no problem!