【Bluetooth 5.0 and three music play modes 】 The Bluetooth FM transmitter uses the latest Bluetooth 5.0 chipset. It supports Bluetooth playback, TF card play (up to 32GB), 3.5mm AUX input to meet your various needs. Note: Set 107-108 MHz to reduce radio interference. 【2 smart USB connections - 5 V / 2.4 A + QC 3.0 】The Bluetooth FM transmitter is connected to the cigarette lighter. It has 2 USB ports: 5V/2.4A + QC3.0. QC3.0 USB port can be charged 4x faster than conventional chargers. You can charge 2 compatible devices like iPhone 6/7/7Plus/8/iPhone X/Samsung S9 plus/S8/S7/S6/EDGE, THC, LG and other phones, tablets, USB devices, etc. at the same time. 【LED voltage display and colored ambient lighting 】 The vehicle voltage is displayed when the FM transmitter is inserted into the car's cigarette lighter and turned on. 7 multi-color options to give your car a comfortable and romantic atmosphere that matches your mood. In addition, the last paired phone can be connected automatically. 【Hands-free calls 】Improved car FM transmitter with built-in microphone. When you accept a phone call, the system automatically switches from music playback to hands-free calling. Press the top button once to answer/end a call. Long press twice to refuse to redial the last dialed number, long press to activate Siri. Convenient one-button control for safe driving. 【Two installation options and 1.1m cable 】The package comes with a vent clip and sticky seat. You can attach it to the car air vent or stick it on the dashboard. With the 1.1 meter long cable, you can use this device freely in the car. Latest Bluetooth 5.0 Technology The latest Bluetooth 5.0 chipset that connects to your devices more consistently and delivers CD-like music. 3 Music Playback Modes Stream high quality sound wirelessly to your car stereo via Bluetooth or AUX connection or insert a TF card. Hands-free function The built-in microphone automatically switches from music playback to hands-free mode when you answer a call. You can answer/end/reject/redial a call using the multi-function button. 2 USB ports 2 USB ports can be charged for 2 devices at the same time. One port is QC3.0 port and can be charged 4x faster than conventional chargers. the other connection is 5V/2.4A. LED Voltage Display for Vehicles LED voltage indicator can monitor your car battery in real time and keep driving safely. Voice assistance (Siri/Google Now) Press the button to activate Siri/Google Now. This is how you can easily control your phone. 7 Color Changes The colorful LED light can be switched to 7 different colors or switch to breathing light mode. Using Tips to Minimize Static Noise 1. Make sure the FM frequency you selected is empty and there is no signal for the station local radio. 2. Make sure you have tuned the FM transmitter frequency exactly as you did on your car radio. 3. Adjust the volume of your car radio to a medium level to minimize static electricity. 4. If you are going for a long trip, please tune the FM frequency to the empty local channel.