Alpatronix C3 Ultra-Portable Mini Capsule Speaker with Enhanced Bass & 3.5mm Audio Jack for Apple iPhone, iPad, iPod, Samsung Galaxy, Nexus, HTC, Blackberry, Nokia, Smartphones, MP3/MP4 Players, Tablet, PC, Laptop [SONPRE EDITION] - (Black) For portability, the AX100 is designed to collapse to Twist the top hemisphere counter clockwise to unlock and expand. In this form, the speaker expands to its full size, increasing the internal resonance and providing a deeper, richer bass. Connect the headphone jack that is neatly stowed under the speaker to any device that comes with a 3.5mm headphone jack. You may raise the device steaming volume to maximum, and then continue to change the volume directly through the speaker, or vice versa, or any combination of the two. To charge the speaker, connect the mini-USB cable to the speaker, and the standard USB cable to any USB charger. When the light is red, the speaker is charging. When the light turns blue, the speaker is charged and ready to go for another 12 hours of continuous playback time.