This Aquarius Bluetooth Car Adapter transmits music or calls from your device, including mobile phones or tablets to your car FM stereo system via Bluetooth. Simply insert the Bluetooth Car Adapter into your car's cigarette lighter, tune into an empty FM frequency and pair the transmitter to that frequency. BLUETOOTH FM TRANSMITTER: Transmit music from Bluetooth devices such as smartphones/tablets to car FM stereo systems by Bluetooth which is much cheaper than buying a Bluetooth car radio. CLEAR HANDS-FREE CALLING: Experience Clear Hands-free Calling: Built-in microphone with CVC (Clear Voice Capture) noise reduction technology to create full duplex sound quality and offer you hands-free talking. COMPACT & PORTABLE: Unlike those bulky transmitters, the Aquarius FM transmitter is smaller and more space-saving, fitting your car cigarette lighter easily for safe driving. Features : LED screen, smartphone fast charge function. FM transmission for music listening in a car. Bluetooth music playback & phone calls. Supports U-disk music playback. USB 2.0 interface output charging. CE certified & RoHS compliant.  Technical Specifications : Bluetooth Range: 5m MP3 / WMA playback SNR ratio : 85dB (FM: 65 dB) Working temperature : 0°C ~ 60°C USB 2.0 port Input voltage : DC 12V - 24V Work current : 5m U-disk compatible : 512MB - 16GB Bluetooth vision: V2.1+EDR Supported Bluetooth protocol: A2DP/AVRCP/HSP/HFP USB output current: ≤2.1A USB output voltage: ≤5.2V±0.25V Specifications : Package Dimensions: 8x5x4cm approx. Brand: Aquarius Materials : Plastic & Electronic Components Available colours: Black, White Easy To Use : Short press the call button till the display digit flicker.  Choose an unused frequency. Tune to the same frequency as this FM transmitter to connect the car stereo system. Box Contains: Aquarius Bluetooth Car Adapter FM Transmitter Hands Car Kit - White