Argos Value Range Radio Cassette Player. 513/3422 ?

What is a 3V DC adapter. Does this mean this mikomi cassette player can be plugged into the AC mains.
I am looking for an inexpensive cassette player with headphone socket and mains connector that I can connect to a pc [via headphone socket]. I do not want to record onto cassette nor do I require CD. Radio is optional [ the reception here is appalling -digital rado might be acceptable.]