with TF card ; Bluetooth 2.0; OV3860 auto link back funtion; horn radiator & 800mAh lithium cell ; Bluetooth 2.0;OV3860 auto link back funtion; play the MP3 files in TF card automotically;3.5mm Aux in , can connect with PC ,Mobile Phone;2Wx2 ch THD 10% horn radiator; horn radiator & 800mAh lithium cell; play/pause,next,prev,vol-,vol+ 5 keys. portable bluetooth speaker