Dual USB Fm Transmitter Modulator Bluetooth-compatible Handsfree Car Kit Audio Mp3 Player With 3.4A Car Fm Transmittor Phone ChargerWirelessly transmit music and calls from Bluetooth-compatible mobile phone to the car FM stereo systemDual USB outputs can charge 2 devices at the same time3.4A output current, rapid charging for phone tablet and most digital productsStrong and elegant design with current displaySupport USB disk, TF card and FM transmitterBuilt-in microphone makes answer calls hands-free, more driving securityCompact size, sturdy body constructionWide compatibility makes it universally suitable for 12-24V cars and trucks on the marketSpecification:USB voltage: DC 12-24VOutput current: 3.4ABluetooth-compatible version: V5.0Frequency frequency: 87.5-108.0MHzAudio format: MP3/WMA/WAV/FLACBluetooth-compatible distance: about 5-10mFM emission distance: about 3-5mUser Tips:1.It is a normal phenomenon that FM product will have some noise because of the interference of the local radio signal.Find a vacant or non-interfered frequency and sync Onever device to that frequency for minimized static noise.2.To achieve best audio quality, please set the volume on your phone or the device to maximum and then adjust the volume for your car stereo;you are not suggested to adjust volume of your car speaker to maximum (this will bring lot noise) .3.Our products support the use of 12-24V normal battery in the car/truck, we recommend that you do not use the product in car/truck that modified the battery.This may cause burned because of instantaneous high current.4.To protect this device, we recommend to remove it from cigarette outlet after use, to avoid instant high start voltage damage the device.5.If you want to charge the phone and listen to the car radio at the same time, please note that your radio frequency and our device's frequency do not get too close.6.Press and hold the middle button for 5 seconds to switch between Chinese and English.Product package:1*charger