... , portable digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, iPod, iPhone, GPS, PSP, ... USB, adaptor DC-5V allow you to enjoy the music, for your option. Use explanationl Battery: ... light turns red while charging, once charging completes, the light turns off; When power is on, indicator ... charging, if power on but not charging, the indicator light turns blue.l Play/pause button: ...