1. The latest Bluetooth compatible technology: The USB FM transmitter is specially designed for car scenes, using the latest Bluetooth compatible 5.3 technology and FM technology, allowing car enthusiasts to easily enjoy wireless music in the car. 2. USB interface power supply: The transmitter can be powered by the USB interface. When in use, the transmitter can be plugged into a USB port with an output voltage of 5V, such as a car USB port (5V) or a car charger port (5V). 3. Upgraded version: The FM02 USB adapter is an upgraded version of the FM01, adding 3 buttons for adjusting channels from 87.5 to 108, volume control and track selection. The Bluetooth compatible version has also been upgraded to Bluetooth compatible 5.3 and is equipped with an LCD display. 4. Good compatibility, no delay: the mini USB adapter has good compatibility, no delay, no lag. It is compatible with almost all cars and mobile phones on the market, making it easy to use and access. 5. Satisfaction : We strive to provide each customer with the highest standard of customer service to you have a pleasant shopping experience. If you have any problems, questions or need assistance, please to contact us directly. Specification: Product model: SFD-FM02 Bluetooth compatible version: V5.3 Working voltage: 5V Effective distance: within 10 meters Audio output: FM transmitter FM frequency range: 87.5MHZ-108MHZ Default frequency: 95.0MHz Signal-to-noise ratio: 95db Answer the phone: support Automatic return connection: support Power supply mode: USB power supply (5V) Product size: about 32 x 17 x 10mm/1.25 x 0.66 x 0.39 inches Color: Black Material: plastic Package Contents: 1 x Car Bluetooth Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.