fm transmitter aux modulator bluetooth handscar kit car audio mp3 player with 3.1a quick charge dual usb car charger

item size : 3.8*4.6*7.8cm / 1.5*1.8*3.1" (l*w*h) model name : car mp3 player voltage : 12v item weight : 132g out power : 5v / 3.1a (smart ic), 5v / 1a material type : abs special features : built-in dual usb 5v / 4.1a output item type : fm transmitters display color : blue bluetooth version : bluetooth 4.0 (support a2dp/sbc/aac/hsp/avrcp) files supported : mp3/wma/ape/flav/wav fm frequency range : 87.5-108.0mhz working voltage : dc 12v-24v port : 2*usb 2.0; 1*tf card input,