2.1 SD speakerSpeaker for cellphone, laptops, ipod, mp3 Enjoy music anytime Built-in amplifier with pure, vivid, ... -in amplifier with pure, vivid, distinct sound Compatible with laptops, iPod, MP3, MP4, MP5, cell phones, PSPs and more Power rating ... to 20kHz S/N ratio: ≥80dB Power Supply: USB 5V/Rechargeable Li-ion Battery Product size: 100 x 66 x 85mm ...