2.1 SD speakerSpeaker for cellphone, laptops, ipod, mp3 Enjoy music anytime Built-in amplifier with pure, vivid, distinct ... player microphone mini SD card portable speaker with bult-in recharge battery specification:Good for use on outside activity. eg: ... request. Specification MINI card speaker Built-in amplifier with pure, vivid, distinct sound Compatible with laptops, iPod, MP3, MP4, MP5, cell ...