... :2~4hoursMaterial:ABS PlasticFunction:Support TF card, USB, FM, can connect to MP3,CD, DVD VCD, iPod ... GPS,PSP,mobile phone, notebook computer.2`Support FM Radio receive External battery holder, easy to ... Support AUX external audio input.4`Built-in FM radio and high quality digital amplifier.5` ... about playing 4hours.7`Easy and convenient control wireless speaker.8`Can connect to computer for power ...