Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: is the boom stereo or mono?
Document: This is the hot setup.Both have input jacks so you can use them as powered speakers with whatever device you want: your iPod, your laptop or desktop, your old Walkman, whatever. Both also have stereo output jacks so you can hook them up to your home stereo entertainment system.The Radio is exactly half as wide as the Boom and only plays only in mono unless you use headphones or hook it up to external stereo speakers.
Not sure why, but Logitech has discontinued the Squeezebox Boom. I own 2 of them and love 'em. Anyone have experience with other all-in-one WiFi streaming radios?Update 9/18/11I asked Logitech about this and received the following reply:"As of right now [there] is no known replacement for the squeezebox boom. We do carry a squeezebox radio which is somewhat similar to the boom. Instead of it being stereo it is mono but still has great sound quality.
UPDATED 5/3/2013: My Squeezebox stopped working (blown right speaker). The internet contains a lot of these complaints. I contacted Logitech and they said they do not offer repair service, but would replace it under warranty (2 years or less) with a UE model. While I like the UE Smartradio, its a mono configuration. Nice sound, but not quite as good as the Boom is, or was.
I was looking all over for a smaller stereo with big sound and network and internet music features. I found it with the Logitech Squeezebox Boom.
I love my Squeezebox Boom, but I am mystified why it is $500 vs the $200 I paid 2 years ago, as it was said to be discontinued. I would buy a stereo for that.
Very pleasant. And there are things like environmental sounds of the ocean or rain etc.Most importantly, the sound quality in this little Boom is superb. This will definitely give Bose some competition. My main stereo is a Bose, and my "Duet" is connected to it.
It's too bad that Logitech didn't incorporate standard RCA audio out jacks. It would have made this a much more flexible piece of audio equipment. The same cable that I tried, I often use to hook my MP3 player to my stereo to play MP3's, so I don't know why it wouldn't otherwise work for the Boom.
While these two systems can work together, the main difference is that the Boom is a standalone system while the Duet requires a separate stereo or speakers.SETUP:  While you may ultimately intend to use your Boom in another room, it is best to perform the setup tasks in the same room with your computer since you will need to go back and forth between the two. Don't worry.
I imagine it will.Overall, I'm very satisfied with the Squeezbox Boom - it does what it does well.Update:  Wow! I just received the Yamaha subwoofer and it makes a hugh difference in the audio quality. The Squeezbox now sounds like a high-end stereo system. The subwoofer adds quite a bit to the overall size of the system, but it's well worth it if you are serious about the quality of the music.
You can listen to stations in all the major cities and probably all the little ones too (if they stream their broadcast on the internet and you know their address). The Squeezebox Boom is not an inexpensive gadget but it comes with a lot that won't be obvious until you set it up. To name a few...nice, compact size suitable for a bedside table; gorgeous stereo sound; wonderful remote; all the convenience features of a standard clock radio (alarms, sleep, etc.
Answer: Stereo.  I think it sounds great.