Mp3?Speaker?comes?with?a?metal?keychain?hook?to?play?music?on?the?go. Built-in?Li-on?rechargeable?battery.?USB?adaptor?and?audio?cable.?Apple?shaped?speaker?compatible?with?iPhone,?iPod?and?Blackberry,?mp3?players,?laptops?or?anything?with?a?3.5mm?jack.?