Stream music from your smartphone, tablet, or any Bluetooth enabled device. ntegrated buttons allow you to adjust the volume, skip music tracks, or take a call mid-playlist with the built in microphone. LED indicator for battery level and Bluetooth pairing. Supports audio playback from a micro SD card. Charging time: approximately 2 hours. Playback time: approximately 3 hours. Lithium battery can be charged with the included micro USB cable.