I bought the speakers to him on my MP3 player (SanDisk Clip Sport) to connect. For me, the best product, in proportion. Weight-size battery-power-Sound Award (12,99) I find these speakers unbeatable. However, you should know or remember that the speaker "only" and can be identified, the speaker himself no further arrangements are possible. Man should therefore already take care, that the device as in my case the MP3 player, already should bring a certain volume. For me it was so that I have my SanDisk Clip Sport at "USA" and he asked, somewhat louder is therefore, as in the setting "Germany" .. where it so well-intentioned "rules are. .. I hope my retzession one or other helps.