Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: So if I use the car lighter for power I don't need to use AA batteries, right?
Document: We had only used this Walkman a dozen times when it started to malfunction. The CD would play on batteries for 10 minutes, and then start showing that the batteries were low and it would stop playing altogether. Our batteries were new and we tested them. Put in new batteries anyway, and the same thing happened right away. Sony customer service only suggestion was to buy Sony AA batteries! Frustrating!
One of the reviewers on here mentioned the crappy sound with the cassette adapter, but I found it to work beautifully in my 1995 Miata. I didn't have to turn it way up either. Simple to look at - looks like a miniature Roomba - and works great. The only drawback is that I also have a GPS I can't live without, so I have to use the batteries on the CD player instead of the cigarette lighter hook-up.
This kit DOESN'T come with instructions.If your cigarette lighter has continual power with the key off ~1.
The care power adapter doesn't stay in the cig lighter very well. So a jiggle and the cord comes out of the socket and the player looses power. If it looses power it looses its place in the book and then you have to spend time getting back to the spot. Frustrating. Should have battery back up.
It works fine, plays well, but when I play the unit through the cassette adapter supplied, the volume is very low even when the unit and car radio are on their loudest setting. I can't really use it in the car which is why I bought it in the first place. I will keep it to use with batteries and earphones. (I tried 2 different vehicles, same results)
But having said that, for what it's supposed to do, I wasn't impressed and would not recommend as well as being overpriced!Review update:  After a couple hours of use, the right speaker blew out. I guess it couldn't handle all that Bass!
Altho' there were a few negative comments about this product, I felt its name was good and bought it. I was very pleased to find everything I needed included in the package. It was easy to set up and use. I tried it on battery power w/earbuds and w/cassette inserted into the automobile system. It has been perfect.A good buy on a great product that is easy to use. Perfect 10!
I absolutely love my CD Player. My car is a 1995 and it has a cassette player. This works perfectly with my car's radio. I would definitely recommend this purchase. It comes with everything you need, including ear buds.
I got this for my husband as a Xmas present since he drives his dad's old car which only has a tape deck. So far he's been very happy with it and we read the other review where someone said you need to press "Stop" before turning off the car and then "PLay" so the CD doesn't start over every time, and that was very helpful.
Don't waste your money, unless you're going to use external power exclusively. The battery slots are up against the cover hinge, (UNDER the lid, which by the way means you'll have to remove a CD to access it), and eventually your finger(s) will stress the hinge to the breaking point. How could Sony have approved such a design?
Answer: Correct, in fact, be SURE TO REMOVE the batteries if using car lighter.