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

Input:
Question: AC Adapter Is the AC Adapter good for 110-220?
Document: It travels well. As others have mentioned the remote is tiny. You may want to consider putting a little piece of Velcro on it and the stereo to secure it into place if losing the remote is an issue.My only complaint is that the battery wore out quicker than I thought. I took it on vacation and forgot the AC adapter, so couldn't use it as much as I wanted. Other than that, I love it!
I think this is a great sounding system for such a small form factor. Not as dynamic as the Bose system but can fit easily into a suitcase. The FM radio is not as good as the iPal (I also own one) at pulling in weak stations but the iPod dock and remote make up for it. Now for the bad news: the battery refused to hold a charge even after 2 days on AC.
I needed speakers that included a rechargeable battery system and good sound. The iM600 and Logitech mm50 were my top two but the superior highs of the iM600 finally won me over. I separately purchased the powered Altec sub for inside AC use and it's definitely worth the extra 40 bucks. The combination is really as good as I could expect for a total of $160.
Really love this dock. Best thing about this unit is how easy it is to use when traveling. Great for camping and beach. Rechargeable battery lasts about 7 hours- FM tuner is a plus for Ipods. System recharges Ipod when docked using AC power. Aux output for portable CD player. Sound is very good- only minus is bass is sometimes lacking. Unit does have subwoofer out but still looking for subwoofer.
Very simple to use and convenient to have both battery and AC adaptor options. The sound is impressive for such a small size. I highly recommend this product for ipod speakers that are portable with a radio option as a huge bonus!
Loved this unit until the AC cord connection in the back of the unit no longer made proper contact with the unit and ceased charging the battery. For a while, I taped it into position but eventually this stopped working as well.
There's no visible way to do it, and it would be very easy to break the unit if you pry too much. I had to call support again for that, and they admitted it was not only not obvious but also not documented in the manual. If you need to switch the adapter, don't fiddle with it too much- just call Altec and get walked through it.
What the Bose does have going for it is great sound, AC/DC capability, the Bose remote which is RF rather than IR so it has a long range. It is a premium product at a premium price.Deciding that price was a consideration I then made a list of almost every product that is on the market, comparing features, form factor, sound and reliability reviews.
The Altec charges Ipods as long as there is an AC connection, whether or not the Altec is turned on. The IM600 does not charge Ipods when the dock is running on its own rechargeable battery. The remote is also IR like the others in the test, and is somewhere between the Bose and Griffin in terms of range and responsiveness. Remote lets you control SFX mode and access four radio presets.
My wife and I love this unit. We take it on vacation with us and can play all our iPod music. Sounds great and is not too big so I can pack it in our checked luggage. Remote is great. The ability to play disconnected from AC is nice too as it does have a built in rechargeable speaker. Perfect for what we need it for. Only down side is that it doesn't charge an iPod Touch 2 generation which we now have. It plays the music, just doesn't charge.
Answer: I contacted Altec Lansing customer support and they claim that the AC adapter is rated up to 240V.