Thank you for viewing! This is a Bluetooth FM transmitter with a USB port. It's easy to use, allowing you to easily listen to your favorite music or audio from YouTube on your car speakers. It has two USB ports with a maximum output of 3.1A, so you can quickly charge smartphones with large-capacity batteries. It also has call answer/end functions, allowing for hands-free calls. ---How to Use--- ① Connect this device to your car's cigarette lighter socket. ② Match the radio frequency of your car audio with the frequency of this device. ③ Connect your smartphone and this device via Bluetooth. With these 3 steps, you can play the audio from your smartphone through your car speakers. In addition, you can also play music from a USB drive containing MP3 files. It supports 12V/24V cars, so it can be used in almost all cars on the market. 【Product Specifications】 ・FM Frequency Range: 87.5～108Mhz ・USB Output: 5V / 1A (left) ・ 3.1A (right) ・Weight: Approximately 30g ・Included: Main unit, instruction manual (English/Chinese) 【Other Notes】 We have confirmed the operation, but this is a foreign product. There may be scratches, etc. Please read the product description and instruction manual. Returns are not accepted due to customer reasons such as a different image, not knowing how to use it, or no longer needing it. To reduce shipping costs and the overall price, we will ship via Yu-Packet Post. Please note that we will ship it after removing it from the box. MP3 player, hands-free calling, fast charging, cigarette lighter socket