1. Introduction
Thank you for choosing the Nulaxy KM20 Bluetooth FM Transmitter. This device is designed to enhance your in-car audio experience by allowing you to stream music, make hands-free calls, and charge your devices conveniently. With its 1.8-inch color screen, flexible gooseneck, and advanced features like enhanced microphone and Bass/Treble Boost, the KM20 provides a versatile and user-friendly solution for vehicles without built-in Bluetooth.
Figure 1: Nulaxy KM20 Bluetooth FM Transmitter
2. Package Contents
Please check the package for the following items:
- Nulaxy KM20 Bluetooth FM Transmitter
- User Manual
- 3.5mm Audio Cable
- Spare Fuse
Figure 2: KM20 with labels for its various ports and features.
3. Product Overview
The Nulaxy KM20 features a user-friendly design with intuitive controls and multiple connectivity options.
- 1.8-inch Color Screen: Provides clear display of frequency, track information, and call status.
- Flexible Gooseneck: Allows for optimal viewing angle and positioning in your vehicle.
- Multi-function Buttons: Dedicated buttons for call management, Bass/Treble adjustment, and channel selection.
- Metal Scroll Wheel: For precise volume control and menu navigation.
- Enhanced Microphone: For crystal-clear hands-free calls with noise cancellation technology.
- Dual Charging Ports: Includes a QC3.0 fast charging port and a 2.4A standard charging port.
- Multiple Audio Inputs: Supports Bluetooth 5.0, AUX port, TF card, and USB drive for music playback.
Figure 3: 1.8" Large Color Screen
Figure 4: Metal Scroll Wheel for Volume and Tuning
Figure 5: Enhanced Microphone for Clear Calls
Figure 6: Flexible Gooseneck for Optimal Positioning
4. Setup Guide
Follow these steps to set up your Nulaxy KM20 FM Transmitter:
- Plug In: Insert the KM20 into your car's 12V cigarette lighter socket. The device will automatically power on and display "KM20" on the screen.
- Bluetooth Pairing:
- On your smartphone, enable Bluetooth.
- Search for available devices and select "KM20" to pair. The screen will show "Bluetooth KM20 Connected" once successfully paired.
- Tune FM Frequency:
- Find an unoccupied FM frequency on your car radio (a frequency with no static or existing broadcast).
- Adjust the FM frequency on the KM20 to match your car radio's frequency. Use the CH+ and CH- buttons or the scroll wheel to change the frequency on the transmitter.
- Audio Connection (Optional): If your car has an AUX-in port, you can connect the KM20 to your car's audio system using the provided 3.5mm audio cable for a direct connection, bypassing FM transmission.
Video 1: Nulaxy KM20 Bluetooth FM Transmitter Setup and Features Overview. This video demonstrates the unboxing, initial setup, Bluetooth pairing, and basic operation of the device.
5. Operating Instructions
5.1 Hands-Free Calling
The KM20 features an enhanced microphone for clear hands-free communication.
- Answer/End Call: Press the Call Button (
) once. - Reject Call: Press and hold the Call Button.
- Redial Last Number: Double-press the Call Button.
- Activate Voice Assistant (Siri/Google Assistant): Long press the Call Button to activate your phone's voice assistant.
Figure 7: Hands-Free Calling with Enhanced Microphone
5.2 Music Playback
The KM20 supports various music sources:
- Bluetooth: Stream music wirelessly from your paired smartphone or tablet.
- TF Card: Insert a TF (Micro SD) card into the TF slot. The device will automatically play music files.
- USB Drive: Insert a USB flash drive into the USB port (not the charging ports). The device will play music files.
- AUX Input: Connect an external audio device (e.g., MP3 player) via the 3.5mm AUX port using the provided cable.
Use the Previous/Next Track buttons (⏪ / ⏭) to navigate tracks. Press the Call Button to Play/Pause music.
5.3 Audio Customization (Bass & Treble Boost)
Customize your audio experience with the Bass and Treble boost feature:
- Press the BASS button to enter Bass adjustment mode. Rotate the metal scroll wheel to increase or decrease bass levels.
- Press the TRE (Treble) button to enter Treble adjustment mode. Rotate the metal scroll wheel to increase or decrease treble levels.
Figure 8: Adjusting Bass and Treble Levels
5.4 Changing FM Frequency
If you encounter interference or wish to change the broadcast frequency:
- Press the CH+ or CH- buttons to adjust the FM frequency on the KM20.
- Alternatively, rotate the metal scroll wheel while in FM mode to fine-tune the frequency.
- Ensure your car radio is tuned to the same unoccupied frequency as the KM20 for optimal audio quality.
6. Charging Functionality
The Nulaxy KM20 is equipped with dual USB charging ports to power your devices:
- QC3.0 Fast Charge Port: Provides rapid charging for compatible devices, up to 4 times faster than conventional charging.
- 2.4A Standard Charging Port: Offers reliable charging for a wide range of devices.
Figure 9: Dual USB Charging Ports
7. Troubleshooting
If you encounter issues with your Nulaxy KM20, please refer to the following common solutions:
| Problem | Possible Cause / Solution |
|---|---|
| Poor audio quality / Static noise |
|
| Bluetooth connection issues |
|
| Hands-free call quality is poor |
|
| Device does not power on |
|
| USB/TF card not playing music |
|
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | KM20 |
| Brand | Nulaxy |
| Connectivity Technology | Bluetooth, Auxiliary, USB |
| Bluetooth Version | 5.0 |
| Screen Size | 1.8 inches (color screen) |
| Charging Ports | QC3.0 + 2.4A USB ports |
| Power Source | Corded Electric (12V car socket) |
| Material | Metal |
| Item Weight | 6.4 ounces |
| Package Dimensions | 5.67 x 4.25 x 2.24 inches |
9. Maintenance
To ensure the longevity and optimal performance of your Nulaxy KM20:
- Keep the device dry and away from 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.
- If not in use for extended periods, unplug the device from the car's 12V socket.
10. Warranty and Support
Nulaxy products come with a standard manufacturer's warranty. For detailed warranty information, technical support, or customer service inquiries, please refer to the contact information provided on the Nulaxy official website or the product packaging. Please retain your purchase receipt for warranty claims.
For further assistance, you may visit the Nulaxy Store on Amazon: Nulaxy Store
