Adopting digital signal processing technique CK308 is an advanced and portable wireless speaker for Bluetooth play TF/SD card USB flash disk external audio input and amplification compatible with most Bluetooth enabled devices.</br>? 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.</br>? Bluetooth 4.0 chip provides auto backlink. Reconnect automatically every time when you turn on the speaker. 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.</br>? Support a maximum of 32G TF card?? allowing more ways to enjoy music. Power on?? insert TF/SD card or USB flash disk?? the wireless speaker would read and play music inside automatically.</br>? 2??200mAh built-in Li-ion battery for approximate 3-6H music time (3 hrs with 100% volume; 6hrs with 50% volume); it takes about 4-6hrs to be fully charged with a standard micro USB cable (DV 5V) if this speaker ran out of juice completely.</br></br>Product Description</br></br><b>??Features</b> <br>?Powered by the built-in 3.7V lithium battery. Please fully charge the speaker 6~8hrs before first use and make sure to charge this speaker once a month due to its 3.7V self power consuming lithium battery. Speaker beeps the first time indicating low batte