... portable digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, Hi ... -fi speaker, U-disk and TF card. Perfect combination of NANO ... output: 2W x1 Requency range: 180Hz-20kHzSensitivity : ≥65 dB Speaker size: 50mm x H24mmPower supplied: USB cable or Built-in ...