Problem description:

After installing the portable head unit, the music volume may be too low, or you may want to play audio through the original car speakers.

Possible cause:

If audio is played directly through Bluetooth, the volume may sometimes be low depending on the phone, vehicle, and Bluetooth audio settings.

For better sound quality and higher volume, we recommend using FM transmission or an AUX connection to play audio through the original car speakers.

Recommended audio connection methods

1. FM Transmission

You can use the FM transmission function to send audio to the original car speakers.

How to use:

1. Open the FM function on the portable head unit.
2. Set an FM frequency on the portable head unit.
3. Tune the original car radio to the same FM frequency.
4. The portable head unit audio will then play through the original car speakers.

Important:

• Make sure the FM frequency on the original car radio is exactly the same as the frequency set on the portable head unit.
• Avoid frequencies already used by local radio stations, as this may cause interference or noise.
• Supported FM frequency range: 87.5–108.0 MHz.

2. AUX Connection

If the original car stereo supports AUX input, we recommend using an AUX cable. This usually provides more stable sound quality and a normal volume level.

How to use:

1. Use an AUX cable to connect the portable head unit to the original car AUX port.
2. Select AUX mode on the original car stereo.
3. The portable head unit audio will then play through the original car speakers.

Recommendation:

If your vehicle supports AUX input, AUX is usually the better option because the sound is clearer and the volume is more stable.

Not recommended: Bluetooth audio only

If the volume is too low, we do not recommend using Bluetooth as the only audio output method.

Please switch to FM transmission or an AUX connection and use the original car speakers to play the audio.

Possible cause: Unstable voltage / power supply.

• Please check whether the voltage at the connection point is stable at 12V.
• Please check the connections, especially the curved parts of the cable.
• Are you connecting any other devices to the cigarette lighter?

Please send us a photo: the full connection setup (from the cigarette lighter → cable → device).

First, follow the on-screen instructions to install the app. Then:

• Turn off your phone’s Wi-Fi.
• Turn on mobile data and enable your phone’s hotspot.
• Set hotspot name to: CAR
• Set hotspot password to: 12345678
• Phone settings: Settings → App Management → “Mirroring” → Display over other apps → Allow

Note: Steps may vary by phone brand, but the principle is the same.

Your device supports multiple ways to play audio through your car speakers:

1、FM Transmission

• Set the same FM frequency on the device and your car radio.
• Avoid using local radio station frequencies as this may cause interference.
• Supported frequency range: 87.5 ~ 108.0 MHz

2、AUX Connection

• Connect the device to your car AUX port using an AUX cable.
• This method provides the most stable sound quality.

3、Smartphone Connection

① CarPlay

• Turn on Bluetooth on your iPhone.
• Device name: CAR-BT_55B9
• Pairing code: 0000

② AirPlay

• Connect iPhone to WiFi: carplay_wifi_xxxx
• Password: 12345678
• Open Control Center → Screen Mirroring → Select Car

③ Android Auto

• Turn on Bluetooth.
• Device name: CAR-BT_55B9
• Pairing code: 0000

④ Wireless Link

• Scan the on-screen QR code to download the APK.
• Enable floating window permission.
• Turn on phone hotspot and turn off WiFi.
• Hotspot name: car
• Hotspot password: 12345678
• Open the mirroring APK.

Tip: AUX provides the most stable sound quality, while FM is suitable if AUX is not available.

The bracket has an adhesive backing with a dustproof film on it. Please remove the dustproof film before installation.

Cause: This is not a device problem. Netflix restricts screen mirroring (DRM/HDCP), so mirroring may be blocked.

If you want Netflix on the car screen, contact us — we can recommend an Android-based head unit that supports the official Netflix app.

Cause: The reverse trigger wire is not properly connected.

If the system does not receive a 12V signal from the reverse light (positive pole), it cannot detect reverse gear and will not switch automatically.