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

Input:
Question: what size batteries does this take?
Document: Don't expect too much if you listen to jazz or pop rock. The body of the unit is all plastic. I can imagine the unit disintegrating into hundreds of pieces if it was knocked off a kitchen counter top. Lastly, the unit can be powered by AC or 8 C-size batteries.I bought this unit to have while working in the garage or basement. So, for it's limited capabilities and since I bought it a reasonable price, it's OK for my use.
I can also use the "Random" function which plays songs randomly... the only problem is that songs are played from all folders and there is no way to randomly play songs from just one single folder.The size of this Naxa portable device is great too, it's not too big so it doesnt' take too much space in my small apartment. Most likely this is not a product to use to throw parties or to take it outdoors but it's perfect for a small apartment like mine.
Didn't work at all. Not on batteries, not plugged in. The thing was just dead. Clearly I can't recommend it!
very light,a lot of features,don't mind the amount of batteries, only gonna use in shop. sound is very clear but not very loud.fits my needs.I would recommend
Installed batteries, inserted SD card, played for less than 5 minutes and the music stopped. Smoke came out of cabinet near rear with an apparent burning smell. Would not play SD cards or USB drives after that. Returned for a refund. Don't waste your money...
I brought this to play on the beach because it has USB adapter for  Flash drive capability. It did not last long, and that TWO of them stopped working with batteries. Yes there was sand everywhere BUT not sure why the batteries (and yes I tried swapping with new ones and used air to clean it) would work the radio BUT when i plugged it in it did work.
i mainly play MP3 or wave CDs or regular cds but it really doesn't matter there is no power in the volume. plenty of power in the radio. i dont use it though. These little players are expensive and for the price should play better then they do. speakers for ipods sound better. but i needed a stand alone with a radio that was portable - i haven't used it with the batteries yet. it a nice gift for a pre teen or your mom.
Actually, it's a very good product but I didn't know what to expect. Mp3 player can mean anything. First, you don't need ear buds. Yay! Second it will play from a flash drive or sd card. Nice! You can plug it into a wall plug or run it on eight &#34;C&#34; batteries. Be careful here. There is no off\on switch. There is a selector switch. You may think it's off but it went to fm radio.
That might be a concern for someone using audio-books or other extended-length tracks (e.g. Podcasts). Not a problem in my case.I&#8217;ll also mention that I use the player on batteries almost all the time. My first set of 8 &#34;C&#34; batteries (Energizers) lasted for 4 months with somewhat sporadic use (once or twice a week). Decent, I suppose, but I was hoping for less battery drain.
I use the jazz setting.PROS:  many features. Plays CD's  MP3  flash drive  SD card  battery or AC  repeat and randon functionsgood sound for speaker sizelight weight even with batteries installedeasy to read displayphone jack  and AUX inCONS: built of lightweight plastic, may not hold up to rough use but with a little TLC should be just fineAM / FM radio picks up great but is tricky to tune as it is analog. Once tuned, it works well.
Answer: 8 "c" cells