-bluetooth speaker -wireless -Support USB ,TF, , -for MP3/4,PC,mobilephone - ... anytime- Built-in battery or USB power supply- With LED light flashing when music on- Built in Lithium battery playback ... ; USB cable can connect the computer's USB interface, LED display 'PC' mode,then enter into USB card reader ... Insert TF card, play audio files Fashionable and Portable Wireless Mini bluetooth speaker