Basically as the title says. We have semi frequent power outages where I live. The noise machine in my daughter’s room goes out and wakes her up. If I were to buy a USB powered one, plug it into a power bank like one of those 10000ma ones you get for charging cell phones, would it have continuous power. Basically like a cheap UPS
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DO NOT leave a lithium battery both charging and discharging indefinitely in your daughter’s room. The suggestion below of a small UPS device intended for routers and they like is the way to go.