Broad Compatibility - Wirelessly Bluetooth fm transmitter stream high quality stereo audio via Bluetooth connection to compatible devices or insert Micro SD card or USB flash driver (both up to 32GB capacity);</br> USB Charging Station - Equipped with dual USB port (5V/2.4A 5V/1A) charge 2 USB devices simultaneously total up to 3.4A;</br> Special Design - Compact gadget with special knob design. High contrast digital screen display for higher visibility;</br> Stereo Solution - QPAU Bluetooth fm transmitter with built-in microphone you can enjoy audio streaming music and hands-free phone calls on the road;</br> Easy to Use - Simply plug into cigarette lighter socket.</br></br>Product Description</br></br>There are many kinds of Bluetooth FM transmitter on the market but QPAU always producing the best. We utilizing the state-of-art technology and design featuring an elegant digital display and 2 extra USB ports 5V 3.4A output in total is the best and most up to date selection for your hands-free phone calls or music through your car stereo system while driving. Audio can be streamed via Bluetooth-enabled devices or insert a Micro SD card (over Class 6) or USB driver flash (up to 32GB capacity). <br/> <br/> <b>Operation Guide:</b><br/> - Plug the FM transmitter into your car cigarette lighter socket for power. <br/> - Find an empty station and keep the FM transmitter and car FM radio at the same frequency. FM channels 87.5 MHz - 108.0 MHz?? 0.1MHz/step. <br/> - Insert a Micro