perfect for use with an mp3. it's the only one I'll do but the operating instructions indicated: mini top portable speaker system with built-in mp3 player, cd / dvd, iphone, ipad, ipod, psp, mobile phone, pc / computer portable, micro sd card slot and a USB port (both up to 32gb) for a computer USB charging cable is included (this is the only cable): it should be put in charge for four hours autonomy announced about 12 hours (this seems to me a lot but why not ..).
the sound is good, the volume and playback forward or back buttons are easy to use, the chamber very small (4.5cm x 4.5cm) and thus easy to carry (an orange strap is supplied with but difficult to insert into hole provided for this purpose but is not essential)
I think it is a product of a good quality / price ratio (22 euros at the time I bought it)
