Exclusive Joystick Design Special five-direction analog joystick design makes your operation easier and ensure driving safer. Multiple Protection Built-in overcurrent protection, overvoltage protection, overcharge protection, overload protection, overheat protection and short circuit protection, provide the safety of the product. Voltage Monitor This FM transmitter can detect and temporary displays the car battery/voltage for 3 seconds after power on, which enables you to monitor the car battery condition easily. <12V Battery failure 12V-12.8V Normal voltage range before car started 13V-14.8V Normal voltage range after car started How to Set up a Bluetooth FM transmitter？ 1.Select FM Mode 2.Plug the FM transmitter into the cigarette lighter or power port. 3.Short press the "CH“ button, Adjust FM Transmitter to the same frequency with car radio by slide the Multi-function button (left or right) to adjust when the LED displays FM frequency. Enjoy Music From Car Speaker 1. Pair your phone with the device via Bluetooth named “UBCH261” Select your favourite song.USB DISK CONNECTING Insert the USB flash drive into the USB flash drive port, then the music in the USB flash drive will be played automatically. How to CHANGE FM station? 1.Unplug the FM Transmitter. 2.Repeat the connect steps above and pair with your phone. Our FM Transmitter adopts Bluetooth 5.0 technology to offer a stable connection for streaming music over FM frequency and making hands-free calls, coming with dual charging ports, which allows you to be immersed in hi-fi music and charge two devices (supporting both QC3.0 and PD 20W fast charge) simultaneously. What sets this smart device apart from the rest on the market is its bass function, making music more stereo and rhythmic. This music pla