... micro-speaker, insure the sound quality.Circular design, exquisite appearance, with 6 buttons.Buttons definition: "MODE", "Stop/Pause","EQ". " ... Phones, iPod, Portable CD Players, Notebook PC etc.Bottom with red or blue LED light.Build-in lithium battery, rechargeable ... SNR: 80dBSpeaker: 1.77" (diameter 45mm) magnetically shielded, 4ohmPower Input: USB cable or Power adapter 5V/1000mAProduct size: 5*5 ...