A:AnswerNo, model NS-P4112 doesn't have Bluetooth or a USB port. It has an auxiliary port which you can use to connect to your car, but it would still need batteries.
A:AnswerI do not experience what you've described. If it is scratching your CD then you will experience repeating section or skipping. Change the unit. Thanks.
A:AnswerFirst thing that comes to mind is to change the batteries. The batteries which were in with my player lasted a very short time. I replaced them with 2 AA batteries, and it's fine now.
A:AnswerYou are correct; the player is old. I had a hard time finding a simple one to use in my system; but, it does take care of the sound I want without carrying a boom box or something like that. I do not use adapter.