Product Name: USB Bluetooth FM Transmitter Product model: FM01 Working voltage: 5V Effective probability: within 10 meters Default frequency: 95.0MHZ Signal to noise ratio: greater than or equal to 95db Answering the call: support Automatic return: support Power supply mode: USB power supply (5V) The product is mainly used in in-vehicle scenarios, using the latest Bluetooth 5.1 technology and FM frequency modulation technology to allow car fans to easily enjoy music without being in the vehicle. Color: Black Material: ABS Package Contents: 3 x FM Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.