» Adopting digital signal processing technique, it is an advanced and portable wireless speaker for Bluetooth play and TF/SD card (power on and insert TF/SD card, the speaker would read and play music inside automatically), compatible with most Bluetooth enabled devices. » This audio player has multi-color LED with magic pre-programmed dynamic visual modes, including romantic, beat dance, flashing styles, and it could be used as both home audio player as well as outdoor Bluetooth speaker, adding more fun to party, camping and other entertainment venues. Colored lamps are changed by short pressing color changing button to spark your life! It could be also used as a car speaker if go for a drive, be a happy joyrider. » Bluetooth 4.0 chip provides auto backlink. Reconnect automatically every time when you turn on the speaker. Support a maximum of 32G TF card, allowing more ways to enjoy music. » Built-in microphone supports hand-free call. It could switch to hand-free mode automatically when phone call coming and switch back to music mode automatically when call finished. One key control for pick up and hang up. » 2,200mAh built-in Li-ion battery for approximate 3-6H music time (3 hrs at 100% volume 6hrs at 50% volume) it takes about 6hrs to be fully charged with a standard micro USB cable (DV 5V) if this speaker ran out of juice completely.