Avoid these speakers completely. They are simple, yes, convenient, yes, but in no way reproduce the music the way a good system will!
Buy a $300 pair of bookshelf speakers...there are lots of good choices out there from Klipsch, Polk Audio, Paradigm or a thousand others. Then get a good integrated amp for $300-$500, NAD makes a really nice budget integrated, or look at the Marantz. Then hook up your smartphone with a mini to RCA cable. (use an old smartphone on wifi...doesnt need to be activated, and you can run Pandora, Spotify, Google Play [or iTunes, if you swing that way], and you can just leave it hooked up...if you are on android, you can even run an app that gives you remote control from another device!)
Another consideration is how long these will last you compared to standard speakers. A good pair of speakers will last you 7, 10, 15, even 20 years! These things will be in a recycle bin in 5.
This will sound an order of MAGNITUDE better than these plastic toys! If you love music, put some effort (and maybe a little money) into a QUALITY music system. You won't regret spending the time or money once you start listening!