This mini speaker is very convenient. Small, lightweight, it does not take place, and fits in your pocket. The sound of a small speaker is OK, but do not expect the quality of a stereo or a base. The jack is handy, you can use it on an ipod, a classic mp3, phone, computer, short on everything! No compatibility issues. Only downside, the object is fragile. One feels when handling to be careful. The bellows opening system does nothing more, and the problem is when trying to close it, it breaks very quickly. But no impact on the operation, it is possible to simply close.