The 12 discCD player was perfect for me because I like allot of different music and I never know what I want to listen to different music when I'm in different moods.
I fitted the changer myself which was quite easy, it's quite a new car. Usually this would cost £80 at Halfords and can I just say that they pay their fitting guys about £5 hourly rate. halfords rake it in. this is a bit of a hint but you can ask the halfords assistant to come round out of work hours and fit the stereo at a reduced price this benefits you and them!
Anyway, the front face comes off which is good for security but never leave it in the car. About 80% of people leave theirs somewhere in the car for example under the seat or mat. And car criminal know this! Always take the face with you. This comes with a carry case so its good and doest get scratched. the face has a tape player which is useful but I think I have only used mine about five times, it is useful if you have an mp3 player you can hook it up via the tape input, but you need to buy a converter I'm sure there are some on eBay.
The changer is quite small so you can put it in the glove compartment if you don't want it in the boot or under the passenger seat. I don't like to put them in the boot because they can slide about and get broken unless you want to drill in your car?
The external changer has 12 slots where you can put cds in but I don not recommended doing this while driving. The main disadvantage I would say is that after I am bored of all of the cds I have put in it's a bit of a chore to take them all out and put them away and put new one on and remember them.
That is another thing because the stereo does not recognise the cd you have to try to remember which number you put the cd you want in.
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Car Radio - Panel Release, Panel/Quick Release - with CD Player, With CD-Player - without CD-Changer, With changer control - with MP3 Playback, With MP3 Player - 208 Watt