Welcome to our store! USB Interface: Powers the device. Connect to any 5V USB port, such as your car's USB port or a car charger. Key Features: 1. FM Frequency Adjustment: Click to switch between 87.5MHZ, 95.0MHZ, and 103MHZ when the device is on and Bluetooth is paired. 2. Play/Pause: Click to pause and play music. 3. Answer Calls: Click to answer incoming calls. Instructions: 1. Plug the FM01 into a 5V USB port in your car. 2. Set the FM frequency by clicking the button, then tune your car radio to the same frequency. 3. The FM01 automatically remembers the last used FM frequency. 4. Find the Bluetooth pairing name 'FM01' on your phone and connect. Music will then play through your car speakers. 5. Adjust the volume: Maximize your phone's volume and adjust the car's volume to a moderate level. Note: Avoid excessively increasing the car's volume, as this can lead to noise and distortion. This product utilizes Bluetooth 5.1 and FM frequency modulation technology for a seamless wireless music experience in your car. Parameters: Product Name: USB Bluetooth FM Transmitter Product Model: FM01 Bluetooth Version: V5.1 Working Voltage: 5V Effective Range: Within 10 meters Audio Output: FM Transmitter Default Frequency: 95.0MHZ Signal to Noise Ratio: 95db Call Answering: Supported Automatic Return: Supported Power Supply Mode: USB power supply (5V) Color: Black