? ? Octeso has always been committed to serving every customer well. No matter what problem you encounter, please feel free to contact us to find a satisfactory solution. We provide 18 months warranty and lifetime support as long as it is a product purchased from our store. Contact Detail: Click the store name behind "sold by" and click the "Ask a question" button to open the contact channel. ? 1. Adjust your car FM frequency to a blank channel. 2. Adjust the transmitter’s frequency to the same channel: Short press the CH button to enter into FM mode. Adjust the frequency by pressing Previous Track/Next Track (Long press to adjust it fast). 3. Bluetooth Connection: Turn on the Bluetooth of your device. Search "BH347" and connect it, or you can directly play music via U disk. ? & ? At night, the soft blue LED light will remain on constantly, allowing you to see easily during the nighttime and will make your car’s internal layout looks cooler and more attractive. Voltage detection will monitor your car's voltage in real-time. If it is below 12V, please replace the battery in time. ? & ?Our Bluetooth transmitter supports voice commands to ensure safe driving, using Siri or Google Assistant to make phone calls, send texts or get driving directions. Get your things done faster and more conveniently with intelligent Siri/Google assistant and enjoy complete voice-control while you driving. ? . & ?With an advanced Bluetooth V5.0 chip, this FM Bluetooth transmitter car provides faster pairing and more stable sound than others. Equipped with electric protection of overcurrent, overvoltage, overcharge, overload, overheat, and short circuit, it’s more reliable and safer to use. ?- & ?High-performance microphone with noise suppression (CVC) technology, grants you a crystal clear call. One button to answering/redialing/dismissing or ending calls. It has wide compatibility with all Bluetooth-enabled devices, such as iPhone, iPad, LG, Samsung, Tablet, HTC, Sony, and other smartphones; Also it will fit all cars/trucks (12-24V). ? - ?Insert a USB flash driver (=32G) into the "Blue" USB port and enjoy it. If that's not enough, it can also play music from your smartphones, iPod, tablet, and more Bluetooth-enabled devices. The Bluetooth FM transmitter will bring you an amazing auditory experience with its clear and stereo sound. ?. & ?Charge 2 devices simultaneously with our Bluetooth car adapter. One port is a quick charge 3.0 port, up to 4X faster than standard chargers, able to charge compatible devices to 80% in just 35 minutes, and the other USB charging port (5V/1A) also functions as a U disk port for playing music.