I bought this surge protector/socket to use with a small audio system with a subwoofer without a switch. This jack is ideal because I can plug in any component (TV, streaming audio player, amplifier, etc.) and leave it "always on", but use the on/off switch to turn the subwoofer on or off as needed. And as a bonus, I use the USB ports to power my Chromecast and a few other devices - that's a lot better than plugging in bulky adapters.
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