... /Vol-, Next/Vol+, and ON/OFF.Built-in lithium battery. Powered by computer USB port or through a power adaptor ... shockproofportable Speaker bag, speaker bag, travel speaker, speaker box, portable speaker, speaker case, mp3 speaker, mp4 speaker, pocket speaker, ... within the climbing buckle, more convenient to carry out. 2. Portable Speakers: you can connect MP3, CD, Walkman, laptop computers,mobilephone ...