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: Does it have a button on top that can lock it?
Document: My wife has this ipod and she's used it daily for the last year and a half. Everything is still running fine on it however there are 2 items I want to mention.1. The "lock" switch on top.The previous generation of ipods was all metal, encased and built tough. This generation and from what I can tell the most recent ones as well have this rounded shape to them and the top lock button is held into place by a little white (or black on the newer model) sticker like cover.
Everything on the ipod works fine, however the hold button at the top is completely broken and doesn't move. Other than that, everything works.
The cover popped off the other day and the lock button got lost so now we've lost the "lock" function of this ipod. I think it was a poor design. Apple really should have used a better material then a sticker to hold the button in place.2. The plugs on the bottomWhen my wife has this ipod plugged into her car car radio she really can't charge it as the two ports (headphoen and charging) ports are to close to eachother. If she forces it she can make it work, but a tiny more space would have solved that issue.Overall it's a good ipod.
I bought this iPod for my best friend's sister because she has never had an iPod before. She absolutely adores it. I bought it used, but it looks brand-new except for a small scratch at the top.
when i got the ipod in the mail, i opened it, it had a chip on the top of it, and scratches on the ipod itself. the ipod also came to me with someone elses songs on it, there for my daughter had to figure out how to delete those songs, so that she could add her own. so the ipod was not ready for use when i got it. otherwise its and ok purchase.
I really like my nano but I do get frustrated because I feel it can be a bit complicated to work. My central round button does not respond very well when manipulated. This could be improved upon.
I'm unhappy with this device because the menu button has never worked properly. Initially I thought it was just me. After reading about it online the menu button is suppose to make the menu go back one screen. When this doesn't happen you can see how frustrating it can be. It only works about once out of 10 attempts.
I have been somewha dissapointed with the new nano ipod. I have the original nano and one thing that i dont like about the new 4th generation is that the screen does not stay dimly lit so that when i want to check time. I have to press a button and wait for it to appear. Also, This nano has frozen up and i wasnt able to use it for hours b/c of this.
Yeah it lasted a year and a half, but it could have lasted much longer had apple used a metal top with a screw or some other design rather then a sticker that relies on adhesive to hold it on. We looked at the new generation last night and they also have the same exact design flaw so we aren't sure what exactly we are going to do, it won't be buying the same design style ipod. Perhaps we'll go with the classic or touch.
It even found some of the songs that my Windows Media Player was too stubborn to play.The accelerometer is indeed a pain at times, but with all these benefits... I really don't care. If you don't plan on changing your songs immediately, put the hold button on and it won't change. This works well if you just want to run straight through a playlist or whatever else. It isn't exactly hard to move the hold button. I did have the problem with it changing over and then not changing the volume.
Answer: it has an on off button no lock button