Product Overview
The Monster Bluetooth FM Transmitter is designed to enhance your in-car audio experience by allowing seamless wireless music streaming and hands-free calling through your vehicle's FM radio. It features dual USB charging ports, Micro SD and USB audio playback, and compatibility with voice assistants like Siri and Google Assistant.

Image: The Monster Bluetooth FM Transmitter shown alongside its product packaging, highlighting its compact design and key features.
Package Contents
- Monster Bluetooth FM Transmitter
- Instruction Manual (this document)
Component Identification

Image: A detailed diagram of the Monster Bluetooth FM Transmitter, pointing out its various components including USB audio port, 3.4A USB-A charging port, microphone, LED display, bass boost button, track/frequency forward/back buttons, FM adjust button, volume/frequency knob, and microSD card slot.
- USB Audio Port: For playing music from a USB flash drive.
- 3.4A USB-A Charging Port: High-speed charging for devices.
- Microphone: For hands-free calling and voice assistant commands.
- LED Display: Shows FM frequency.
- Bass Boost Button: Enhances bass performance.
- Track/Frequency Forward Button: Skips to next track or increases FM frequency.
- Track/Frequency Back Button: Skips to previous track or decreases FM frequency.
- FM Adjust Button (CH): Used to enter FM frequency adjustment mode.
- Volume/Frequency Knob (Multi-function Button): Rotates to adjust volume or frequency; press to play/pause, answer/end calls, or activate voice assistant.
- MicroSD Card Slot: For playing music from a Micro SD card.
- 12-24V Input: Connects to car cigarette lighter socket.
Setup Instructions
- Power On: Insert the Monster Bluetooth FM Transmitter into your vehicle's 12V-24V cigarette lighter socket. The LED display will light up, indicating it is powered on.
- Set FM Frequency:
- Press the CH button (FM Adjust) to enter FM frequency adjustment mode. The frequency on the LED display will flash.
- Rotate the Volume/Frequency Knob left or right to select an unused FM frequency on your car radio. Choose a frequency that has no strong broadcast signal to minimize interference.
- Once selected, press the CH button again or wait a few seconds for the frequency to stop flashing.
- Tune your car's FM radio to the exact same frequency selected on the transmitter.
- Bluetooth Pairing:
- On your mobile device, enable Bluetooth.
- Search for available Bluetooth devices and select "Monster FM" (or similar name) from the list.
- Once paired, the transmitter will confirm the connection, and audio from your device will be transmitted to your car's FM radio.
Operating Instructions
Music Playback
The transmitter supports music playback via Bluetooth, Micro SD card, or USB flash drive.

Image: Illustration showing a USB drive and a MicroSD card, indicating their use for direct audio playback through the FM transmitter.
- Bluetooth Streaming: After successful pairing, play music on your mobile device. The audio will be transmitted wirelessly to your car stereo.
- Micro SD Card Playback: Insert a Micro SD card (up to 32GB) with audio files into the Micro SD card slot. The transmitter will automatically detect and play the music.
- USB Flash Drive Playback: Insert a USB flash drive with audio files into the USB Audio Port. The transmitter will automatically detect and play the music.
- Track Control: Use the Track Forward (>>) and Track Back (<<) buttons to skip tracks.
- Play/Pause: Press the Volume/Frequency Knob to play or pause music.
- Volume Adjustment: Rotate the Volume/Frequency Knob to adjust the volume.
Hands-Free Calling

Image: A hand interacting with the FM transmitter's call button, with icons for answering, hanging up, and declining calls, illustrating its hands-free calling capability.
- Answer Call: When an incoming call rings, press the Volume/Frequency Knob once to answer.
- End Call: During a call, press the Volume/Frequency Knob once to end the call.
- Reject Call: When an incoming call rings, press and hold the Volume/Frequency Knob for 2 seconds to reject the call.
- Redial Last Number: Double-press the Volume/Frequency Knob to redial the last dialed number.
Voice Assistant Compatibility

Image: A visual representation of the FM transmitter's compatibility with Siri and Google Assistant, showing example voice commands for music, navigation, and messaging.
The transmitter supports Siri and Google Assistant for hands-free voice commands.
- Activate Voice Assistant: Press and hold the Volume/Frequency Knob for 2 seconds to activate your phone's voice assistant (Siri or Google Assistant).
- Once activated, you can issue commands such as "Play my favorite playlist," "Give me directions to the nearest gas station," or "Text Mom, I'm on my way."
Bass Boost Function

Image: A visual demonstrating the bass boost feature, showing a person enjoying enhanced audio in a car.
Press the dedicated Bass Boost Button (labeled 'b') to activate or deactivate the enhanced bass performance for richer sound.
Charging Devices

Image: The FM transmitter with its two USB-A charging ports, illustrating its capability to charge two devices simultaneously with 3.4 Amp USB power.
The transmitter is equipped with two USB ports for charging your devices:
- One 3.4A USB-A charging port for high-speed charging.
- One standard USB port for charging or USB audio playback.
Simply connect your device's USB charging cable to the appropriate port on the transmitter.
Maintenance
- Keep the device clean by wiping it with a soft, dry cloth.
- Avoid exposing the device to extreme temperatures, direct sunlight, or moisture.
- Do not use abrasive cleaners or solvents.
- Ensure the cigarette lighter socket is clean and free of debris for optimal connection.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power to the transmitter. | Loose connection; vehicle's cigarette lighter socket is not working. | Ensure the transmitter is firmly inserted. Check if the car's cigarette lighter socket is functional with another device. |
| Static or poor audio quality. | FM frequency interference; transmitter and car radio frequencies do not match. | Change the FM frequency on the transmitter and car radio to an unused channel. Avoid frequencies with strong local radio stations. |
| Bluetooth not connecting. | Transmitter not in pairing mode; device's Bluetooth is off; already connected to another device. | Ensure the transmitter is powered on. Turn off and on your device's Bluetooth. Forget "Monster FM" from your device's Bluetooth list and re-pair. |
| Cannot hear calls clearly. | Microphone obstruction; low volume settings. | Ensure the microphone is not covered. Adjust the volume on both the transmitter and your car stereo. |
Specifications
| Feature | Detail |
|---|---|
| Brand | XTREME DIGITAL LIFESTYLE ACCESSORIES |
| Model | B09BD7ZQTT |
| Connectivity Technology | Bluetooth, USB |
| Power Source | Corded Electric (12V-24V Car Cigarette Lighter) |
| USB Charging Ports | 2 (including 1x 3.4A high-speed port) |
| Audio Playback | Bluetooth, Micro SD Card, USB Flash Drive |
| Special Features | Bluetooth FM Transmitter, Built-In Microphone, Hands-Free Calls, Bass Boost, Voice Assistant Compatible (Siri, Google Assistant) |
| Material | Plastic, Electronic Components |
| Item Weight | 2.82 ounces |
| Package Dimensions | 4.8 x 2.95 x 2.24 inches |
Safety Information
Always follow these safety guidelines to ensure proper and safe use of your Monster Bluetooth FM Transmitter:
- Keep the device away from heat sources, direct sunlight, and liquids.
- Do not use the device while driving if it distracts you from operating the vehicle safely. Utilize hands-free features.
- Avoid placing the device near other wireless devices to minimize potential signal interference.
- Do not attempt to disassemble, repair, or modify the device yourself. This may void the warranty and pose a safety risk.
- Ensure the device is securely plugged into the cigarette lighter socket to prevent dislodging during driving.
Warranty and Support
For warranty information and customer support, please refer to the product packaging or contact the manufacturer directly. Keep your purchase receipt as proof of purchase.
Manufacturer: Jem Accessories
Brand: XTREME DIGITAL LIFESTYLE ACCESSORIES





