... for your convenience, connecting to your MP3,MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, Hi-fi ... card. Perfect combination of NANO-style button and noble metallic shell designed. Several colors and power supply manners including battery, computer USB, adaptor ... : ≥65 dB Speaker size: 50mm x H24mmPower supplied: USB cable or Built-in 3.7 lithium battery 3.7V/500mAh ...