Pros: For forty dollars I can't complain. Extremely portable and amazingly they work!!! I expected only one of the speakers to work, a short in the wiring or poor connections which would degrade functionality...Nope not at all. I would buy these again. I actually purchased two at this price and haven't had to use the other pair. I have dropped them and they are quite dirty now and still boosting the output of computers I work with.

Cons: None. They could improve on the sound quality but that would cost you more so there are No cons to these 40 dollar speakers.

Overall Review: Eventually the internal springs will lose their ability to retract the wires inside the speaker casing but that is too be expected in any spring. I have owned these for four months and use them quite frequently on the job so i imagine the retracting feature will last others longer.