Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Directions are a little confusing.. If I am in Europe, plugging an American electronic into the box, do I turn the switch on to say 110V or 220V?
Document: It worked as it should have.I use it on my mixer. (Bought the mixer from USA to be use in Aus)I wished the device came with proper instructions, struggled initially on how the switches. (whether to turn it to 110V or 220V).I burnt one fuze trying to figure that out.
With the switch set to 220 (but still plugged into a 110 V source) I measured 55 V at the output indicating a 2:1 step down. Presumably when the source is actually 220V the output will be stepped down to 110V.I've seen comments questioning the grounding. I checked continuity from the ground input on the plug to the ground socket at the output and found that there is grounding continuity between the two, and it is isolated from the other connector pin and socket connections as it should be.
I use it for devices I brought from Germany (220V) over to the US (110V). No adapter needed. It works just fine. No heat no noise. The cord is pretty short though.
This converter did the job perfectly! We had a lighted make-up mirror, electric razor, etc. on our trip that needed a converter, as opposed to an adapter in Europe. It is a little heavy, but I put it in my carry-on and there were no problems going through security.If you want to be sure you are covered for everything you have that needs a converter this will do the job!
Machine works flawless with my playstation 3. Is generating some heat, but has a an easy on / off switch on the side so you can turn it off when not in use.
I haven had this converter for a month. I use it solely with a purifier I bought when I was living in Spain, which originally works at 220V, 55W, 60Hz. All I need from it is to have the purifier alive for 7-8 hours in a row every night. The first time I turned it on it crackled and the purifier wouldn't turn on straight away. I thought I was some kind of adjustment time, an after a minute it started working properly.
The directions say transforms up to 300 watts output, but only 150 watts if run continuously. Worked perfectly to inflate US spec Aerobeds (built-in electric pump) brought over to the UK on house move.
It works great and is priced right. Very helpful to have. I brought something back from Europe that is 240Volt and this does the trick so I can use it in the US.
I am using this converter for my 220V-humidifier purchased abroad. It's very quiet (virtually no whizzing sound) and works great.
Unbelievable! Bought this ahead of time before going to Europe. Here I am in Europe and the damn thing doesn't work.Tried to  power up my iPad in Budapest but no dice, norhing! My iPad is important to me  and serves several functions but Litefuze really let me down with this lemon. Not sure if you can test these before leaving home but I 'll certainly try next time.
Answer: Turn the switch to the voltage you are accessing- what is coming out of the wall. For example, I am using it in USA for a European printer. So mine says 115 even though he printer uses 220.