Features 1. Adjust the FM frequency. After the product is powered on and before Bluetooth is paired, click the button to change the FM frequency (a total of 87.5MHZ, 95.0MHZ, 103MHZ three frequencies can be selected) 2. When playing a song, click the button to pause and play. 3. Answer the call, when someone else calls in, you can click the button to answer the call. 4. With automatic FM frequency memory function, each time it is turned on, it is the default FM frequency the last time it was used. 5. The volume can be adjusted. When playing music, you can adjust the phone music volume to the maximum and the car volume to the moderate. It is not recommended to increase the volume of the car too much, because the louder the volume of the car, the more serious the noise and distortion. Specification Colour: Black, Material: Metal Bluetooth version: V5.1 Working voltage: 5V Effective probability: within 10 meters Audio output: FM transmitter Default frequency: 95.0MHZ Signal to noise ratio: 95db Answer the call: support Automatic return: support Power supply mode: usb power supply (5V) Condition: Manufacture:China,Chinese Factory Homegrown products for Sale Friendly Tips: Please allow minor error of measurement,due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding Package Included 1x adapter 1x manual