FM Transmitter,Wireless Bluetooth FM Transmitter Receiver Radio Adapter Car Kit with Handsfree Calling,Support Car Voltage Detection,MP3 Player,Dual USB Car Charger for USB Disk Samsung,etc. 3 USB charger: Smart shunt fast charge technology with output 5 V/ 3.1 A current simultaneously supports fast charge of 2 devices,full compatible for iphone,Samsung,Google,LG,HTC Huawei,and most of other mobile phone,tablet,camera,navigation electronic equipment,voice broadcast,etc. Bluetooth Hands-free call: Built-in microphone to automatically switch from music playing to hands-free mode when answering a phone call,one click answering a call or hang up or refuse a call.And built-in noise cancellation circuit and excellent HI-FI Stereo Sound make the call and music clearer. Memory Playback Function: Can memory frequency,song,volume.Once restart after power failure,it automatically returns to the set frequency,song,and volume before the power failure. Music Playing function: Support MP3/WMA playing function,can insert USB Disk play music,and support bluetooth music,compatible with all kinds of music APPs.Stream music and calls directly from your mobile devices to car stereo system via FM radio signal(FM range from 87.5 to 108 Mhz),and you can enjoy music while charging. Car Voltage Detection: Built in intelligent voltage monitoring chip,LED digital display monitoring,real-time monitoring of car battery voltage,to avoid voltage abnormalities,flameout,anchor and other problems. 12 months warranty.,if you have any question,please feel free to contact us and you will get response within 12 hours!