GDFMT3994 - FM Transmitter Goodis - Free user manual and instructions
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| Product Type | FM Transmitter |
| Brand | Goodis |
| Model | GDFMT3994 |
| Dimensions | Approx. 12 cm x 6 cm x 2 cm |
| Weight | Approx. 50 g |
| Power Supply | DC 12V (car cigarette lighter) or USB 5V |
| Frequency Range | 87.5 - 108.0 MHz |
| Audio Input | Bluetooth, AUX 3.5 mm, USB, SD card |
| Output Power | Up to 10W (car adapter dependent) |
| Charging Ports | Dual USB output (2.1A + 1A) |
| Display | LCD screen with backlight |
| Functions | FM transmission, hands-free calling, music playback from USB/SD/AUX/BT, EQ presets |
| Care & Cleaning | Wipe with dry soft cloth. Do not use liquids or abrasives. |
| Safety | Keep away from moisture and extreme temperatures. Use only supplied cable. |
| Spare Parts & Repairability | Contact Goodis support for replacement cables or fuses. Not user-serviceable internally. |
| General Information | Compatible with most car models. Supports Bluetooth 5.0. Auto-scan frequency. |
Frequently Asked Questions - GDFMT3994 Goodis
How do I pair my phone with the Goodis GDFMT3994?
Turn on the transmitter and enable Bluetooth on your phone. Search for GDFMT3994 in the list and tap to pair. Once connected, the blue LED will stay lit.
What frequencies should I use to avoid interference?
Choose an unused FM frequency in your area. The device defaults to 87.5 MHz but you can adjust using the CH+ and CH- buttons. Scan for the clearest channel.
Can I charge my phone while using the FM transmitter?
Yes, the GDFMT3994 has dual USB ports (2.1A and 1A) that can charge your phone or other devices while transmitting music.
How do I play music from a USB drive?
Insert a USB drive (FAT32, max 32GB) into the USB slot. The transmitter will auto-play MP3 files. Use the MODE button to switch to USB mode.
Why is there no sound or poor audio quality?
Ensure the FM frequency is matched on both transmitter and car radio. Reduce distance between devices and avoid overlapping strong radio stations. Also check phone volume.
How do I answer a call hands-free?
When a call comes in, press the phone button on the transmitter. The microphone will pick up your voice. Press again to hang up. Audio will pause automatically.
Does the transmitter work with all car radios?
It works with any FM radio receiver. Most car radios support FM, but some newer models may have limited tuning. Ensure your car radio can tune to the selected frequency.
How do I reset the device?
With the transmitter powered on, use a pin to press the reset hole (if available). Alternatively, unplug and plug again after 10 seconds.
Can I use the transmitter with a power bank?
Yes, it can be powered via USB cable using a 5V power bank. However, the charging output may be limited to 1A when used this way.
What should I do if the device gets hot?
If it becomes excessively hot, unplug immediately. Allow it to cool in a well-ventilated area. Avoid covering the device while in use. If persists, contact support.
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