Not sure if you have already bought the dictionary, but I'd share this with you anyway.
I did buy an electronic dictionary for DS but it got broken within a year...not surprised as somehow things don't last for v long with him
Let me add that we have been trying to report this to the manufacturer but without luck: terrible automated answering that gets you nowhere.
Now when we were looking to replace that we decided to buy a Kindle instead. And that’s one thing that I won’t regret – both my boys love reading on that and we have downloaded an excellent dictionary which has been more comprehensive than any electronic dictionary I have ever come across.
I’d therefore strongly recommend that you might want to look into buying an electronic book reader rather than a dictionary. I could carry on but it might give the impression that I have been paid to advertise for electronic book readers