Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can I use them on 220V power supply?
Document: I bought the Bose 161 speakers a few years ago. You can mount them on the wall and set them on the shelf. You can use them as stereo speakers or add them to your surround sound system. You can even mount them to the floor stands. I set them next to the TV and used them as stereo speakers since already have Bose Surround Sound Speakers. The Bose 161 speakers can handle over 100 watts which is great. They have a power sound. Bose is a name you can trust.
I really have enjoyed the speakers. I am not a sound nerd, so I don't have all the insight other reviewers may have. I have the speakers connected to a Pioneer receiver and am using a Pioneer sub-woofer. I do not think this receiver can properly power the speakers from what I understand. I know that the sound is very clear and I couldn't be happier with my purchase. I currently only have these 2 speakers for Lt and Rt front.
Bose speakers are by far superior to the others. I use the 161's for rear speakers and they serve the purpose well.
I use these for my side and rear surround speakers. Paired with Bose L & R & C speakers and an Onkyo receiver & sub. Very happy with the sound.
The Bose 161 speakers have a white finish and blend into our white bookcases very well. The sound is fine for background music when we are entertaining. I would recommend them highly for that type of use.
I have 1 pair of these speakers already-great sound-I use them for back and surround speakers-not huge base, but that's why you by a sub for a 7.1 or 7.2 channel speaker system-I must admit I have a small apt and these sound awesome for this application
Bose is a name for good quality. These speakers were a little larger than what I wanted, but they would do. I use them for extension speakers on my sound system for another room. I am a bit disappointed with the sound quality as the bass falls off somewhat. I have heard better bass on smaller speakers. But they serve my purpose.
We use these in a professioanl training environment, matched to an 80 watt HK amp. They are the main speakers. They are clean, but not loud enough for our large training room full of people. These would be well served as rear speaking in a 5.1 system or in small rooms where loud volumes are not needed.The speakers were a bit smaller than I expected.
Also tell me if they use "cheap untreated paper" for their drivers, why did I look inside my Bose Freestyle's speaker and found an almost plastic material on the drivers? And if their sound is sooo old from the 60s, why does it sound so rich, full, clear, crisp, lifelike and bassy?Outside of that, these speakers are great and VERY cheap in price. Anyone who says these should be any cheaper is insane.
I got these to run the surround side of my 500 Watt pioneer 5.1 system. I have Bose 301's on the front, and these in the back. They seem to kick out some good highs and lows with no distortion what so ever. I really recommend  these if you don't want to spend a lot of money, but you need surround. I wouldn't use them on the front though, unless your hooking up a low wattage receiver.
Answer: they are not powered speakers - you jus connect to your hi-Fi