... and More.With special particular patent in worldwide. Be applicable for MP3, MP4, laptop, PC, MD, mobile phone, and more With ... : 5V +0.5V Suitable temperature: 0 - 40 C Be applicable for MP3, MP4, laptop, PC, MD, mobile phone, and more With ... particular patent in worldwide The resonator will be expanded while playing, that will increase the low frequency outputting If power off ...