Introduction
Thank you for choosing the ammtoo GS400 ULTRA Wireless Gaming Headset. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting to ensure you get the best experience from your headset. Designed for immersive gaming and high-quality audio, the GS400 ULTRA offers versatile connectivity and superior comfort.

The GS400 Ultra Wireless Gaming Headset with its accompanying USB dongle.
Package Contents
- GS400 ULTRA Wireless Gaming Headset
- USB Dongle (for 2.4GHz wireless connection)
- USB Type-C Charging Cable
- 3.5mm Audio Cable
- User Manual (this document)
Setup
1. Charging the Headset
Before first use, fully charge the headset. Connect the USB Type-C charging cable to the headset's Type-C port and the other end to a USB power source (e.g., computer USB port, USB wall adapter). The LED indicator will show charging status.
A full charge takes approximately 3 hours. A voice alert will sound when battery capacity is below 3%.

Battery life details: 35-40 hours gaming, 15-20 hours with RGB lights, 3 hours charging time.
2. Connecting the Headset
The GS400 ULTRA offers three connection modes: 2.4GHz Wireless, Bluetooth, and 3.5mm Wired.

Connectivity options for PC, Mac, PS4, PS5, Switch, and mobile devices.
2.1. 2.4GHz Wireless Mode (USB Dongle)
This mode provides low-latency wireless audio, ideal for gaming on PC, Mac, PS4, PS5, and Nintendo Switch (via Type-C adapter).
- Insert the 2.4GHz USB dongle into an available USB-A port on your PC, Mac, PS4, or PS5. For Nintendo Switch, use the Type-C adapter if needed.
- Power on the headset by pressing and holding the Power button for 2 seconds.
- Switch the headset to 2.4GHz Wireless Mode using the mode switch button (labeled "2.4G").
- The headset should automatically connect to the dongle. The LED indicator on the headset will confirm connection.
2.2. Bluetooth (BT) Mode
Use this mode for wireless connection to Bluetooth-enabled devices like PCs, laptops, Macs, and mobile phones.
- Power on the headset by pressing and holding the Power button for 2 seconds.
- Switch the headset to BT Mode using the mode switch button (labeled "BT"). The headset will enter pairing mode, indicated by a flashing LED.
- On your device, go to Bluetooth settings and search for "GS400 ULTRA" (or similar).
- Select the headset to pair. Once connected, the LED indicator will stabilize.
2.3. 3.5mm Wired Mode
This mode is compatible with PC, Laptop, Mac, PS5/PS4 controllers, and NS/Xbox controllers.
- Connect one end of the 3.5mm audio cable to the headset's 3.5mm jack.
- Connect the other end to the 3.5mm audio port on your device or controller.
- The headset will operate in wired mode. Note: Some headset functions (like RGB lighting, wireless controls) may not be available in wired mode.
Operating Instructions
Familiarize yourself with the headset's controls for optimal use.

Detailed view of the multi-function controls on the headset.
Headset Controls:
- Power On/Off: Press and hold the Power button for 2 seconds.
- Play/Pause: Click the Power button.
- Answer/Hang up Phone Call: Click the Power button.
- Refuse Phone Call: Double-click the Power button.
- Volume +: Long press or click the Volume + button.
- Volume -: Long press or click the Volume - button.
- RGB Light On/Off: Double-click the Volume + button.
- Microphone On/Off: Click the Volume - button.
- Mode Switch: Use the dedicated switch to toggle between 2.4GHz Wireless Mode and BT Mode.
RGB Lighting
The headset features RGB lighting. By default, the RGB light mode is active when the headset is turned on. To conserve battery life and extend usage time (up to 35-40 hours), you can turn off the RGB lights by double-clicking the Volume + button. With RGB lights on, battery life is approximately 15-20 hours.
Maintenance
Cleaning
- Wipe the headset surfaces with a soft, dry cloth.
- Do not use harsh chemicals, cleaning solvents, or strong detergents.
- Keep the charging ports and audio jacks free of dust and debris.
Storage
- Store the headset in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid placing heavy objects on the headset.
- If storing for an extended period, charge the battery to about 50% to prolong its lifespan.
Battery Care
- Avoid fully discharging the battery frequently.
- Do not expose the battery to extreme heat or cold.
- If the headset will not be used for a long time, charge it periodically (e.g., every 3 months) to maintain battery health.
Troubleshooting
No Sound / Low Volume
- Ensure the headset is powered on and properly connected (2.4GHz dongle, Bluetooth paired, or 3.5mm cable securely plugged in).
- Check the volume levels on both the headset and your connected device.
- Verify that the correct audio output device is selected in your device's sound settings.
- If using 2.4GHz wireless, ensure the dongle is recognized by your device.
Microphone Not Working
- Ensure the microphone is not muted (click Volume - button).
- Check that the microphone is properly positioned.
- Verify that the correct input device is selected in your device's sound settings.
- Test the microphone with another application or device.
Connectivity Issues
- 2.4GHz Wireless: Ensure the dongle is firmly inserted and the headset is in 2.4GHz mode. Try a different USB port.
- Bluetooth: Ensure Bluetooth is enabled on your device and the headset is in pairing mode. Forget the device in your Bluetooth settings and re-pair.
- Move closer to your device to ensure you are within the accessible connection range (up to 49ft for 2.4GHz).
Specifications

Internal components highlighting the 40mm Neodymium Magnet Driver and ear cushion design.
| Feature | Specification |
|---|---|
| Model | GS400 ULTRA |
| Speaker Diameter | 40mm |
| Impedance | 32Ω ±15% |
| Sensitivity | 105dB ±3dB |
| Frequency Range | 15Hz-20KHz |
| LED Working Voltage | DC5V ±5% |
| Working Current | ≤200mA |
| Headset Jack | USB + 3.5mm 4Pin |
| Battery Capacity | 1000mAh |
| Bluetooth Version | 5.3 |
| Wireless Type | Bluetooth, RF (2.4GHz) |
| Impedance Range | up to 32 Ω |
| Headphone Pads Material | Synthetic leather |
| Weight | 395g |
| Features | With microphone, Volume Control |
| Certifications | CE, RoHS |

2.4GHz wireless connectivity features, including low latency (≤20ms) and range (≤49ft).

Microphone noise cancellation capabilities, reducing background noise for clearer communication.
User Tips
- Optimize Battery Life: If you need longer gaming sessions, remember to double-click the Volume + button to turn off the RGB lighting. This can extend your battery life from 15-20 hours to 35-40 hours.
- Low Latency for Gaming: For critical gaming where every millisecond counts, always prioritize the 2.4GHz wireless connection using the USB dongle. It offers a delay of ≤20ms, providing a highly responsive experience.
- Microphone Clarity: Position the noise-canceling microphone close to your mouth for the best voice capture and to maximize its effectiveness in reducing background noise.
- Comfort Adjustment: Take advantage of the adjustable headband and plush ear cushions for extended comfort during long gaming sessions.
Warranty and Support
The ammtoo GS400 ULTRA Wireless Gaming Headset comes with a standard manufacturer's warranty against defects in materials and workmanship. Please retain your proof of purchase for warranty claims.
For technical support, troubleshooting assistance, or warranty inquiries, please contact your retailer or the manufacturer's customer service. Contact details can typically be found on the product packaging or the official brand website.





