Introduction
The Nulaxy KM18 Color Bluetooth 5.4 Car Adapter is designed to enhance your in-car audio and charging experience. This upgraded version features a 1.8-inch TFT color display, dual fast-charging ports (PD 30W & QC3.0 18W), crystal-clear hands-free calling, and multiple music streaming options. It also includes a safety feature for real-time car battery voltage monitoring.
Package Contents
Please check the box for the following items:
- Nulaxy KM18 Color Bluetooth 5.4 Car Adapter
- Auxiliary Audio Cable
- User Manual
Product Overview
The Nulaxy KM18 Color features an intuitive design for ease of use. Below is a visual representation and description of its key components.

Image: The Nulaxy KM18 Color Car Adapter showing its 1.8-inch TFT color screen with various information such as song name, connected device, incoming phone number, and real-time battery voltage. Control buttons for channel, previous/next track, and multifunction are visible around the central knob.

Image: A comparison chart illustrating the enhancements of the KM18 Color model over the classic KM18. Key upgrades include a larger 1.8-inch TFT color screen, USB QC3.0 18W and Type-C PD 30W charging ports, support for 7 EQ modes, and permanent battery voltage display.
Setup
- Insert into Car's Cigarette Lighter: Plug the Nulaxy KM18 Color into your car's 12V/24V cigarette lighter socket. The device will automatically power on, and the 1.8-inch TFT color display will light up, showing the FM frequency and battery voltage.
- Tune FM Frequency: Find an empty FM frequency on your car radio that has no active broadcast. Then, adjust the FM frequency on the KM18 Color to match your car's radio frequency. This ensures a clear audio connection.
- Bluetooth Pairing:
- On your smartphone, enable Bluetooth.
- Search for available devices and select "KM18 Color" to pair.
- Once connected, the device display will show the Bluetooth icon as solid, indicating a successful connection.
Operating Instructions
Music Playback
The Nulaxy KM18 Color supports three methods for music playback:
- Bluetooth: Stream music directly from your Bluetooth-enabled device (smartphone, tablet) to your car stereo.
- MicroSD Card: Insert a microSD card (up to 32GB) loaded with MP3/WMA/WAV/FLAC files into the designated slot. Use the device controls to navigate tracks and adjust settings.
- Auxiliary Input: Connect your audio device using the provided 3.5mm auxiliary cable.

Image: The Nulaxy KM18 Color Car Adapter showcasing its versatility with three music playback options: directly from a MicroSD card, via an Aux cable connection, or wirelessly through Bluetooth from a smartphone.
EQ Modes and Playback Modes (MicroSD Card)
When playing music from a microSD card, you can customize your audio experience:
- 7 EQ Styles: Choose from Natural, Rock, Pop, Classic, Soft, Jazz, or DBB (Dynamic Bass Boost).
- 3 Playback Modes: Select Repeat All, Repeat One, or Random playback.
Hands-Free Calling
The device supports crystal-clear hands-free calls with its stable Bluetooth connection and built-in echo-cancellation technology.

Image: A woman driving, demonstrating the hands-free calling feature of the Nulaxy KM18 Color Car Adapter. Icons below the device illustrate various call functions: Answer, Redial, Hang Up, Reject, Shows Incoming Call, and Private Call.
Dual Fast Charging Ports
Equipped with 1 PD (Power Delivery) 30W port and 1 QC3.0 (Quick Charge) 18W port, allowing for simultaneous high-speed charging of two devices. These ports charge up to 4 times faster than conventional charging methods.

Image: The Nulaxy KM18 Color Car Adapter plugged into a car's power outlet, actively charging two smartphones via its dual USB ports: one PD 30W and one QC3.0 18W, demonstrating its fast-charging capability.
1.8" TFT Color Display
The large color screen provides a wider visual interface to clearly show incoming phone numbers, track names, FM frequencies, battery voltage, and Bluetooth-connected devices.

Image: The Nulaxy KM18 Color Car Adapter's 1.8-inch TFT color screen displaying information, alongside an illustration of Bluetooth 5.4 technology, emphasizing faster and more stable connections, automatic pairing, and improved sound quality.
Battery Voltage Monitoring
The KM18 Color is equipped with a voltmeter that displays the real-time condition of your car battery. The normal voltage range is 13.2V to 14.7V when the car is turned on and in motion, and 12.2V to 12.8V when the car is parked and the ignition is turned off. This feature helps protect your car's battery.
Safety Instructions
- Do not use this product if you are not familiar with car electrical systems.
- Always ensure your car's battery is in good condition before use.
- This device may interfere with other wireless devices in close proximity.
- Keep away from high temperatures and humidity.
- Dispose of the product and its components according to local regulations.
Specifications
| Brand | Nulaxy |
| Model Name | KM18 |
| Connectivity Technology | Bluetooth |
| Special Feature | Hands-Free Calls, Dual Fast Charging Ports (PD 30W & QC3.0 18W), 1.8" Color Screen, 7 EQ Modes, Battery Voltage Display |
| Power Source | Corded Electric (Car Cigarette Lighter) |
| Supported Media Type | Bluetooth, MicroSD Card, Aux Input |
| Control Method | Touch |
| Compatible Devices | Smartphones, Tablets, Laptops, MP3 Players, Car Stereos |
Troubleshooting
- No Power: Ensure the device is securely plugged into the car's cigarette lighter socket and the car's ignition is on. Check the car's fuse for the cigarette lighter.
- Poor Audio Quality/Static: Adjust the FM frequency on the KM18 Color and your car radio to an unused channel. Ensure no strong radio stations are broadcasting on the selected frequency. Increase the volume on both the device and your car stereo.
- Bluetooth Disconnection: Ensure your phone's Bluetooth is enabled and within range. Re-pair the device if necessary. Ensure no other Bluetooth devices are interfering.
- Charging Issues: Verify that the charging cable is properly connected to both the device and your phone. Ensure the phone's charging port is clean.
Warranty
The Nulaxy KM18 Color Bluetooth 5.4 Car Adapter comes with a 24-month warranty from the date of purchase. Please retain your proof of purchase for warranty claims.
Support
For further assistance, technical support, or warranty inquiries, please visit the official Nulaxy website or contact their customer service. Refer to the user manual included in the package for specific contact details.
Product Videos
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