Introduction
Thank you for purchasing the Baseus S-09 Pro Series Car FM Transmitter. This device allows you to stream audio from your smartphone or other devices to your car's FM radio, and also provides fast charging capabilities. Please read this manual carefully before use to ensure proper operation and to maximize the product's lifespan.
Product Overview
The Baseus S-09 Pro Series Car FM Transmitter is designed to enhance your in-car audio experience and provide convenient charging. Key features include:
- FM Transmitter Functionality: Broadcasts audio to your car's FM radio.
- Bluetooth 5.3 Connectivity: For stable wireless audio streaming from compatible devices.
- Flash Drive Playback: Supports audio playback directly from a flash drive (up to 512GB).
- Fast Charging: Equipped with a USB-C port supporting PD 18W (Max) fast charging.
- Dual-Mic System: Provides premium sound quality and clear calls.
- Large LED Screen with Dual Display: Shows frequency band and battery voltage alternately.
- Triple Charging Ports: Offers multiple charging options.

Figure 1: Front view of the Baseus S-09 Pro Series Car FM Transmitter, showing the display, control knob, and USB ports.
Package Contents
Please check the package for the following items:
- Baseus S-09 Pro Series Car FM Transmitter
- Instruction Manual (this document)

Figure 2: The Baseus S-09 Pro Series Car FM Transmitter shown in its retail packaging.
Setup
- Insert into Car Cigarette Lighter Socket: Plug the Baseus S-09 Pro Series Car FM Transmitter firmly into your car's 12V/24V cigarette lighter socket. The device will power on automatically, and the LED display will light up.
- Tune FM Frequency:
- On the FM Transmitter, press and hold the multi-function knob (the large central knob) until the FM frequency on the LED display starts flashing.
- Rotate the multi-function knob left or right to adjust the frequency. Choose an empty FM frequency (one with no radio station broadcasting) to minimize interference.
- On your car's FM radio, tune to the exact same empty frequency you selected on the transmitter.
- Once matched, the transmitter is ready to broadcast audio to your car stereo.
- Bluetooth Pairing:
- After the device powers on, it will automatically enter Bluetooth pairing mode. The Bluetooth icon on the display may flash.
- On your smartphone or Bluetooth-enabled device, open the Bluetooth settings and search for available devices.
- Select "Baseus S-09 Pro" (or similar name) from the list to connect. Once connected, the Bluetooth icon on the transmitter's display will stop flashing and remain solid.

Figure 3: Illustration showing connection options: via flash drive and Bluetooth 5.3 pairing with a smartphone.
Operating Instructions
Audio Playback
- Bluetooth Audio: Once paired, play music or audio from your smartphone. The audio will be transmitted to your car's FM radio.
- Flash Drive Audio: Insert a USB flash drive (up to 512GB, formatted to FAT32) containing MP3 audio files into the designated USB port on the transmitter. The device will automatically detect and play the audio files.
- Control Buttons:
- Multi-function Knob: Rotate to adjust volume. Press once to play/pause.
- Previous Track Button (◀◀): Press to go to the previous track.
- Next Track Button (▶▶): Press to go to the next track.
Hands-Free Calling
- Answer/End Call: Press the multi-function knob once to answer an incoming call or end an ongoing call.
- Reject Call: Press and hold the multi-function knob for 2 seconds to reject an incoming call.
- Redial Last Number: Double-press the multi-function knob to redial the last dialed number.
- Switch Call to Phone: During a call, press and hold the multi-function knob for 2 seconds to switch the call between the transmitter and your phone.

Figure 4: The device highlighting its dual-mic system for premium sound quality during calls and music playback.
Charging Devices
- The transmitter features multiple USB ports for charging your devices.
- USB-C Port: Supports Power Delivery (PD) 18W (Max) fast charging. Use a compatible USB-C to USB-C or USB-C to Lightning cable for fast charging supported devices.
- USB-A Ports: Provide standard charging for various devices.

Figure 5: The transmitter connected via its USB-C port to an iPhone for fast charging.
Display Information
- The large LED screen alternately displays the current FM frequency and the car battery voltage.
- FM Frequency: Indicates the frequency the transmitter is broadcasting on.
- Battery Voltage: Shows the real-time voltage of your car's battery, allowing you to monitor its health.

Figure 6: The LED screen displaying both the FM frequency (87.5) and the car battery voltage (12.5V).
Maintenance
- Keep the device dry. Do not expose it to moisture or extreme temperatures.
- Clean the device with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Avoid dropping or subjecting the device to strong impacts.
- Store in a cool, dry place when not in use.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power/Display off | Not properly inserted into cigarette lighter; Car socket fuse blown. | Ensure firm connection. Check car's fuse box. |
| Static/Poor audio quality | FM frequency interference; Volume too low. | Change to a different, empty FM frequency. Increase volume on both transmitter and car stereo. |
| Cannot pair Bluetooth | Device not in pairing mode; Bluetooth disabled on phone. | Ensure transmitter is in pairing mode. Enable Bluetooth on your phone and search again. |
| Fast charging not working | Cable not compatible; Device does not support fast charging. | Use a certified fast-charging cable. Ensure your device supports PD 18W. |
Specifications
- Model Name: S-09 Pro Series
- Model Number: C10762200113-00
- Hardware Interface: Bluetooth
- Compatible Devices: Car Stereo System, Smartphone, Tablet
- Special Features: FM Transmitter
- Audio Input: 3.5mm AUX
- Audio Output Mode: Stereo
- Audio Output Type: FM Radio, Bluetooth
- Voltage: 12 Volts (DC)
- Power Source: Corded Electric
- Wireless Type: Bluetooth
- Bluetooth Version: 5.3
- Media Type Supported: MP3 (from flash drive)
- Package Dimensions: 17 x 11.6 x 3.9 cm
- Item Weight: 80 Grams
- Color: Black
Warranty and Support
Baseus products typically come with a standard manufacturer's warranty. Please refer to the warranty card included in your product packaging or visit the official Baseus website for detailed warranty terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact Baseus customer service through their official channels or the retailer from whom you purchased the product.
You can find more information and support on the Baseus Store on Amazon.





