Introduction
The Custom Accessories GOXT 23666 Wireless FM Transmitter allows you to wirelessly transmit and play music or audio files from your portable devices through your car's FM stereo system. This device is compatible with iPods, iPads, iPhones, MP3 players, and smartphones. Simply connect the transmitter to your car's 12-volt power socket, tune to an available FM channel, and connect your audio source via the 3.5mm audio jack, USB port, or SD card slot. A remote control is included for convenient adjustment of volume, track selection, and FM channel tuning.
Safety Information
- Do not expose the device to moisture, extreme temperatures, or direct sunlight.
- Avoid dropping or subjecting the device to strong impacts.
- Do not attempt to disassemble or repair the device yourself. Refer to qualified service personnel.
- Ensure the device is securely plugged into the 12V power socket to prevent accidental disconnection during driving.
- Keep the remote control away from small children.
Package Contents
- 1 x Custom Accessories GOXT 23666 Wireless FM Transmitter
- 1 x Remote Control
Product Overview
The GOXT 23666 FM Transmitter is designed for ease of use in your vehicle. It features a compact design that plugs directly into your car's 12V accessory socket. The device includes a digital display, control buttons, a 3.5mm audio input jack, a USB port, and an SD card slot for various audio sources. A separate remote control provides convenient access to key functions.

Image showing the Custom Accessories GOXT 23666 Wireless FM Transmitter, featuring its main body, 12V plug, and display.
Setup
- Power Connection: Insert the FM transmitter firmly into your vehicle's 12-volt accessory power socket. The device display should illuminate.
- Tune FM Frequency: On the FM transmitter, select an unused FM frequency. This is typically a frequency with no strong radio station broadcasting on it. Then, tune your car's FM radio to the exact same frequency. A clear, static-free frequency is ideal for optimal audio quality.
- Connect Audio Source: Choose one of the following methods to connect your audio device:
- 3.5mm AUX Cable: Connect one end of a 3.5mm audio cable (not included) to your audio device's headphone jack and the other end to the transmitter's 3.5mm AUX input.
- USB Drive: Insert a USB flash drive containing MP3 or WMA audio files into the transmitter's USB port.
- SD Card: Insert an SD card containing MP3 or WMA audio files into the transmitter's SD card slot.
Operating Instructions
- Playing Audio: Once your audio source is connected and the FM frequencies are matched, your car stereo should begin playing audio from your connected device.
- Volume Control: Adjust the volume using either the remote control or your car's stereo volume knob. For best sound quality, set the transmitter's volume to a moderate level and control the main volume from your car stereo.
- Track Selection (USB/SD Card): When playing from a USB drive or SD card, use the remote control's track forward/backward buttons to skip between songs.
- FM Frequency Adjustment: If you encounter interference, use the remote control or the buttons on the transmitter to change the FM frequency to another clear channel, then re-tune your car stereo.
- Equalizer Settings (Remote Control): The remote control may offer equalizer presets to adjust the audio output for different music genres. Refer to the remote control's markings for specific functions.
Maintenance
- Clean the device with a soft, dry cloth. Do not use liquid cleaners or aerosols.
- Ensure the 12V plug and audio ports are free from dust and debris.
- Store the transmitter in a cool, dry place when not in use.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound or poor sound quality | Incorrect FM frequency, low volume, loose connection, strong local radio station interference. | Ensure transmitter and car radio are on the same clear FM frequency. Increase volume on both transmitter and car stereo. Check all cable connections. Try a different FM frequency. |
| Remote control not working | Dead battery, obstruction, out of range. | Replace the remote control battery. Ensure no obstructions between remote and transmitter. Point remote directly at the transmitter. |
| USB drive or SD card not recognized | Unsupported file format, corrupted files, improper insertion. | Ensure audio files are in MP3 or WMA format. Reinsert the USB drive/SD card. Try a different USB drive/SD card. |
Specifications
- Model: GOXT 23666
- Brand: Custom Accessories
- Power Source: 12 Volts DC (Corded Electric)
- Connectivity Technology: USB, 3.5mm AUX
- Wireless Communication Standard: FM Radio Frequency
- Compatible Devices: Car Stereo, Smartphone, MP3 Player, Radio
- Supported Media Types: SD Card, USB Flash Drive
- Audio Output Mode: FM Transmission, Stereo
- Control Method: Remote Control
- Color: Black
- Bluetooth Support: No
- Included Components: 1 Wireless FM Transmitter, 1 Remote Control
- Manufacturer: GOXT
- GTIN/UPC: 077341146599
- ASIN: B06XGXHHK5
Warranty and Support
For warranty information or technical support, please refer to the packaging or contact Custom Accessories customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.





