These little critters work great. They're amazingly cheap (Edit: Well, they used to be. I paid $12 for them in February 2017), but in the few months I've had them, they've worked flawlessly (Edit: After 10 months, they always are still flawless). . I use them to turn off my Roku gadgets when their connected displays are off. This is a great way to avoid exceeding my ISP's monthly bandwidth limit without having to retrain my family to stop their video streams before they turn off the TV. I can think of other use cases. If you have a home theater system and your subwoofer has an "Auto" setting that sometimes turns it off when you don't want it to, you can use this band to control the subwoofer's power and disable auto-on. disabled function. Such an application would have the added benefit of eliminating or avoiding ground loops by ensuring that the source and subwoofers are connected to the same AC circuit. And I suspect the most common use would be to power your PC by powering your monitor and printer so they don't use power when idle.
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