This pair of earbuds is made to go along with the Sonic theme MP3 player and radio. But, they'll work with anything that has a headphone jack. They're nicely detailed with 3D Sonic faces on the exterior of the buds. They're almost classic looking (they'd have to be! To keep the spikes short enough to wear) but do have the green eye detail. The cords are kept neat by the Sonic shaped rubber piece. This is that same cut-in relief material that some of the most popular keychains are made of. The jumping pose looks nice, and the material captures the detail.
HOWEVER...the quality of the sound is not supposed to be that great. These usually cost $9.99, but can be had for free with a purchase of $50 or more in Sonic Electronics at participating Toys R Us in 2010. 

The package for these earbuds shows them off well. Everything is clearly visible, and it uses some nice Sonic & Shadow stock art. The back tells you it comes with 3 sizes of buds (for different ear sizes) & also gives the technical specs for them (speaker size 10mm, magnet type, etc) It's a decent & tough package.