You Must UNPLUG this evidently.
931178
I like this real well until, I realized yesterday that I had forgotten to unplug it the last time and the heater had stayed warm.  36 hours that heater had stayed on. Thank God the house did not burn down.
4767703
The power input port or the plug itself is too small, so it disconnects unless you shim an piece of paper or other item to retain the power connection.
3193006
This item has been glitchy. I often have to do the old unplug/plug-in trick to get it to work properly again.
1696048
beware there is no automatic shut off!! Don't forget to unplug it or risk starting a house fire!
4074280
I've had this plugged in for a while now and well, lets just say I am killing fly's left and right.
2052265
When you disconnect the charger turn off the laptop. All other good.
3831311
This thing works exctly as I needed, but was difficult to figure out how it works cause came without directions . But. Thanks to youtube. It's been running a few days now . But woke up this morning to find that it is off.  Took my tester and tested the power suply and there is power so seems it's a quitter. Hmmm.
3205064
The switch to change speeds broke after about uses. Now I have to use a knife to reach inside and slide it over then plug it in. So power is on and speed is set prior to being plugged in. Which makes it dangerous
825721
This is not the item for you if you need to use it for more than a few hours without being plugged in.
1565384
be aware that you must remove the ballast wiring and connect the tube directly to the 110V.
4454001
Unplug your device [MUST] Once you pop open the door take note at the plastic piece that depresses the metal switch-so that the device knows the door is on. You will need to tape something in here, rip the tab off the filter, cut it in half, fold it, and tape it the hole with packaging tape. Once this switch is depressed re-install the filter then plug it in. Be careful turning the unit on as to touching the filter will  present a little shock, but this time the unit functions without the door on. You will be able to see EXACTLY where its arcing and thus be able to fix the problem. Place a piece of black electrical tape over any spot you see an electrical spark, arc and test until they are all gone unplugging the unit each time you apply electrical tape. Congratulations you have just repaired your filter. I had exchanged 2 of these units before I discovered this. Its been working silently for weeks now on the highest setting. Before it was snapping and popping so much it would wake me up in the middle of the night, its not even in the same room.

Other then that, its a good unit. I own one for each room.
600946
It worked very well and you didn't have to leave it plugged in to run it once it starts you can unplug
4376579
These things have a short life span. You should buy two at once and TURN THEM OFF WHEN YOU DO NOT NEED THEM.
2202886
I have been having to turn off computer so i can safely unplugg it Keeps saying its not able to unplugg so i figured id turn off laptop so i won't lose my important documents on it
4653953
There is no way to turn on this. When they selling they should tell people they need to buy separately power plug.
2762912
All you need to know is that this product is life-threateningly dangerous. There is a large amount of capacitance built in, which by itself would be a good thing. However, it's not isolated from the mains input. What this means is that when you power this device off and pull out the plug from the 110V AC socket, you can get a mighty serious shock. Yes, I found that out the hard way. My hand was painful for an hour after the AC plug just brushed against it. If this amount of energy were to offload through your body, passing through your heart, it could be fatal.

Another sign of bad engineering is that if there's no load, when you turn the device off, it basically stays on. For a really long time.

Did I mention that as soon as you provide a load, it actually start making a loud hissing noise? Or that the course voltage adjustment has severe lag, and it's really hard to dial in the exact voltage you want?

I don't write reviews often, and I try to stay positive, but this is complete and utter dangerous junk.
1157521
This requires a 3 pronged outlet and causes outages when I use it at the same time as my microwave.