1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your Gammeefy JC400 Switch 2 Controller. Designed for an enhanced gaming experience, this controller features advanced technology and customizable options. Please read this manual thoroughly before use to ensure optimal performance and longevity of your device.
2. Key Features
- Ergonomic Grip: Crafted with 360° palm-contour technology for reduced fatigue during extended gaming.
- RGB Lighting: 9-color adjustable light ring joysticks with 16.7 million color customization via Keylinker App.
- Hall Effect Joysticks: 5M cycle lifespan with zero drift technology for precise control.
- Wake-Up Function: Instantly wake the console from sleep mode (requires initial setup with original Joy-Con controllers).
- Turbo & Auto Attack: 3-level adjustable Turbo function (5/12/20 shots per second) for continuous button output.
- Console Protection: Rugged shell with less-than-1mm gap and rear-mounted latch for secure console placement and scratch prevention.
- Programmable Buttons: Customize controls with single/multi-key mappings, loop programming, and temporary enable/disable functions.
- Adjustable Vibration & Gyroscope: 5 levels of adjustable vibration and 6-axis gyroscope for immersive motion control.
- Long Battery Life: Equipped with a 1000mAh battery, providing up to 10 hours of playtime in light mode.
3. Product Overview
The Gammeefy JC400 controller integrates your Nintendo Switch 2 console directly into its body, providing a full-size, ergonomic handheld gaming experience. It features illuminated joysticks and programmable back buttons for enhanced control.

Figure 1: Gammeefy JC400 Switch 2 Controller with console inserted, showcasing RGB joysticks and back buttons.
4. Setup Instructions
4.1 Inserting the Switch Console
- Ensure the console latch on the back of the controller is in the unlocked position.
- Carefully slide your Nintendo Switch 2 console into the central slot of the JC400 controller. Ensure it is seated firmly.
- Push the console latch to the locked position to secure the console.

Figure 2: Proper insertion of the Nintendo Switch console into the controller.
4.2 Connecting the Controller & Activating Wake-Up Function
The JC400 controller connects wirelessly to your Switch 2 console. For the wake-up function to work, an initial setup is required using your original Switch 2 Joy-Con controllers.
- With original Joy-Con controllers connected, navigate to Settings > Controllers > Change Grip/Order on your Switch 2 console.
- Press and hold the HOME button on the JC400 controller for 3 seconds until controller icons appear on the screen.
- To activate the wake-up function: Remove the right Joy-Con for 1 second, then reattach it. This action registers the JC400 for wake-up functionality.
- Once activated, a brief press (0.5 seconds) of the HOME button on the JC400 will instantly wake the console from sleep mode.

Figure 3: Visual guide for the wake-up function activation process.
Video 1: Demonstration of the JC400 Switch 2 Handheld Controller, including console insertion and basic functionality. (Creator: Winroy)
5. Operating Instructions
5.1 RGB Lighting
The joysticks feature 9-color adjustable light rings. You can customize the lighting effects and colors (16.7 million options) using the Keylinker App. The lighting is designed to be vibrant yet eye-friendly.

Figure 4: Smart RGB Joystick Lighting with various modes and brightness adjustments.
5.2 Hall Effect Joysticks
Experience precise and drift-free control with Hall Effect joysticks, boasting a 5 million cycle lifespan. This electromagnetic induction technology ensures durability and accuracy.

Figure 5: Internal view and benefits of Hall Effect Joysticks.
5.3 Turbo & Auto Attack Function
The controller supports both auto and manual Turbo functions, allowing continuous output of a base button. This is useful for games requiring rapid, repeated presses. You can set the Turbo speed to 5, 12, or 20 shots per second.
5.4 Programmable Functions
Customize your gameplay with loop and temporary programming functions:
- Single/Multi-Key Mappings: Assign up to 21 button values (A+B+X+Y+L+ZL+R+ZR+L3+R3+D-pad) to the ML and MR programmable buttons.
- Temporary On/Off: Enable or disable programming buttons to prevent accidental mid-game activations.
- Loop Programming: Automate combo repetition for seamless execution in games.

Figure 6: Manual & Automatic Programming features on the controller.
5.5 Adjustable Vibration & 6-Axis Gyroscope
The controller offers 5 levels of adjustable vibration for a realistic gaming experience. The sensitive 6-axis gyroscope provides fast, delay-free motion control, ideal for Switch motion-sensing games like Zelda and Mario Kart 8 Deluxe.

Figure 7: 6-Axis Gyroscope and 5-Level Vibration features.
5.6 KeyLinker App Customization
Utilize the KeyLinker App to further customize your controller settings, including joystick dead zones, RGB light colors, brightness, and button layouts. This allows for a personalized and optimized gaming experience.

Figure 8: KeyLinker App interface for advanced controller customization.
6. Maintenance
The Gammeefy JC400 controller is designed with a rugged shell and scratch-resistant padded contact surface to protect your Switch 2 console from accidental drops and scratches. Regularly inspect the console latch to ensure it remains secure.
7. Troubleshooting
- Controller not connecting: Ensure the console is properly seated and the latch is locked. Long-press the HOME button on the controller to initiate pairing. If issues persist, try re-activating the wake-up function as described in Section 4.2.
- Joystick drift: The Hall Effect joysticks are designed to prevent drift. If you experience any drift, ensure the controller firmware is up to date via the KeyLinker App. If the problem continues, contact customer support.
- Battery not charging: Ensure the USB-C cable is securely connected to both the controller and a power source. Allow 2-3 hours for a full charge.
- Wake-up function not working: Verify that the initial setup steps with the original Joy-Con controllers (Section 4.2) were completed correctly.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | JC400-LT-US |
| Brand | Gammeefy |
| Battery Capacity | 1000mAh (1 9V battery included) |
| Playtime | Up to 10 hours (in light mode) |
| Charging Time | 2-3 hours |
| Joystick Lifespan | 5 Million Cycles (Hall Effect) |
| RGB Lighting | 9-color adjustable, 16.7M customization via App |
| Vibration Levels | 5 levels |
| Gyroscope | 6-axis |
| Package Dimensions | 13.15 x 5.16 x 2.44 inches |
| Item Weight | 14.9 ounces |
9. Warranty and Support
For warranty information, technical support, or any inquiries regarding your Gammeefy JC400 Switch 2 Controller, please refer to the official Gammeefy website or contact the seller directly. Keep your purchase receipt for warranty claims.
Visit the Gammeefy Store for more information.