Got a few of these a while back, being a professional energy nerd. They are pretty good at what they’re good for, but not necessarily intuitive. What they are good for is keeping chargers from vampiring juice. Big chargers like drills not phones. It’s a big help if you have a watt meter to run with it t osee whether it will work on things.
Glad I wasn’t awake at 1:xx AM to comment on this. I bought them a month or so ago (I think from woot.)
They do function as described. It’s that simple fact that makes them horribly annoying. When the unit decides to cut power to the offending vampire, the only way to reverse course is to push a button on the unit.
For example, you install this behind a desk. Connected are two transformer plugs. One for cell phone, one for speaker system on computer. Finished with work and leave for evening. Unplug phone, power down machine. Arrive at work next day. Plug in phone, turn on computer. Oh, hey, look! My phone isn’t charging and I have no sound! Yeah, that’s right. Either wait 30 minutes for the unit to discover that you need power, or crawl your a$$ under your desk and push the freakin’ button. Do. This. Every. Day.