... 4hoursMaterial: ABS PlasticFunction: Support TF card, USB, FM, can connect to MP3,CD, DVD VCD, iPod, iPhone, PSP, Mobile Phone, ... 7.Easy and convenient control wireless speaker.8.Can connect to computer for power supply Built-in digital power amplifier, ... :Qualifications: If you want to know more Speaker production please without hesitate to contact me. and welcome to visit our Factory at any time ...