k-1937bt portable speaker bus bluetooth speaker led light usb portable mini bus speakers car player wireless bluetooth speaker

functions: 1.tf card slot, can read tf card, play mp3 files. 2.usb port, can read usb device, play mp3 files. 3.with aux audio-in function, as lapspeaker. 4.with earphone audio-out, can connect earphone or other audio device. 5.external rechargeable 5c battery. 6.built-in fm radio. 7.led display. 8.super bass sound package included: 1* mini hi-fi speaker 1* usb charge audio cable 1* 5c battery