The WGP Mini UPS acts as a bridge between your wall outlet and your devices. Under normal conditions, it passes power through to your router while simultaneously keeping its internal batteries charged. The moment the mains power fails, it switches to battery mode instantly (0ms transfer time), ensuring your internet connection does not drop or restart. This specific 5/12/12V model is highly valued for its versatility. Since most home setups consist of an ONU (Optical Network Unit) and a Wi-Fi router that may require different voltages, this single unit can power both at once using the included DC-to-DC cables. Its small footprint makes it easy to tuck away behind a desk, and the 10400mAh capacity is generally sufficient to outlast most standard "load-shedding" or maintenance windows.