1. Introduction
This manual provides detailed instructions for the safe and effective use of your SJCAM C400 C400Pocket 4K Vlog Camera. Please read this manual thoroughly before operating the device and retain it for future reference.
1.1 Product Overview
The SJCAM C400 is a versatile 4K vlog camera designed for capturing high-quality video and photos. It features a detachable design, 6-axis image stabilization, a 154-degree wide-angle lens, and a long-lasting battery, making it suitable for various recording scenarios from daily vlogging to action sports.

Figure 1.1: SJCAM C400 C400Pocket 4K Vlog Camera and Accessories
1.2 What's in the Box
- C400 Camera Unit (x1)
- Battery Handle / Controller (x1)
- Frame Mount (x1)
- Waterproof Case (x1)
- USB Type-C Cable (x1)
- Hand Strap (x1)
- Back Clip (x1)
- Flat Bottom Bracket (x1)
- Helmet Base (x1)
- Tripod (x1)
- Magnetic Strap (x1)

Figure 1.2: Contents of the Package
2. Setup
2.1 Charging the Battery
Before first use, fully charge the camera and battery handle. Connect the included USB Type-C cable to the charging port on the camera unit or the battery handle, and then to a USB power adapter (not included). The charging indicator will show the charging status.
2.2 Inserting a MicroSD Card
Locate the microSD card slot on the camera unit. Insert a compatible microSD card (Class 10 or higher, up to 128GB recommended) with the contacts facing down until it clicks into place. To remove, press the card gently until it springs out.
2.3 Assembling the Camera and Handle
Align the camera unit with the battery handle and slide it into place until it securely locks. The camera can be used independently or attached to the handle for extended battery life and enhanced control.

Figure 2.1: Modular Design of the C400
3. Operating Instructions
3.1 Power On/Off and Basic Operation
To power on the camera, rotate the screen on the handle. This action also powers on the camera unit. The front 1.3-inch touch screen allows for intuitive control, including zooming and switching between modes with a simple touch.

Figure 3.1: Rotating Screen for Power On and Mode Selection
3.2 Shooting Modes
The C400 offers various shooting modes to suit different creative needs:
- Standard Video Recording: Capture high-resolution video up to 4K/30fps.
- Time-Lapse: Condense long periods into short, dynamic videos.
- Slow Motion: Record fast-paced action in slow motion (e.g., 720P/120fps).
- Motion Detection: Automatically start recording when motion is detected.
- Loop Recording: Continuously record, overwriting the oldest files when the memory card is full.
- Burst Shooting: Capture multiple photos in quick succession.
- Timer Shooting: Set a delay before taking a photo.

Figure 3.2: Time-Lapse and Slow Motion Capabilities
3.3 Wireless Control and Connectivity
The C400 features ultra-high-speed 5G WiFi for quick transfer of high-quality photos and 4K videos. Use the dedicated SJCAM app on your smartphone for remote shooting, precise parameter settings, real-time preview, and live sharing. The detachable controller also allows for wireless operation up to 8 meters away via Bluetooth.

Figure 3.3: Wireless Handheld Controller in Use
3.4 Waterproofing
Utilize the included waterproof case to protect your C400 camera. The case allows the camera to be submerged up to 30 meters (98 feet), making it suitable for snorkeling, surfing, and other water activities.

Figure 3.4: Underwater Usage with Waterproof Case
4. Features
4.1 High-Quality 4K Recording
The C400 is equipped with a 1/2.8-inch CMOS sensor and an f/2.0 large aperture lens, providing clear and vivid images. Its 154-degree ultra-wide-angle field of view captures expansive scenes. Record smooth video at 4K/30fps, with additional options for 2.5K and 1080P resolutions.

Figure 4.1: 4K Video Quality
4.2 6-Axis Image Stabilization and Horizon Steady
Benefit from advanced 6-axis Electronic Image Stabilization (EIS) and a horizontal correction function. This technology ensures smooth and stable footage even during dynamic activities, eliminating concerns about camera shake.

Figure 4.2: Image Stabilization in Action
4.3 Extended Battery Life
The C400 is equipped with a high-performance lithium-ion battery, allowing for approximately 460 minutes (over 7 hours) of continuous recording at 4K30fps when using the battery handle. The Type-C charging port provides convenient power options.

Figure 4.3: 7-Hour Battery Life
4.4 Hands-Free POV Recording
The magnetic strap accessory enables comfortable hands-free Point-of-View (POV) recording. Simply attach the camera to the magnetic pendant worn around your neck for immersive first-person footage.

Figure 4.4: Hands-Free POV Recording
5. Maintenance
5.1 Cleaning the Camera
- Use a soft, lint-free cloth to clean the camera body and screens.
- For the lens, use a specialized lens cleaning cloth and solution. Avoid touching the lens directly with your fingers.
- Ensure the camera is powered off before cleaning.
5.2 Storage
- Store the camera in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, ensure the battery is partially charged (around 50%) to prolong its lifespan.
- Use the provided storage bag or a protective case to prevent scratches and damage.
5.3 Waterproof Case Care
- After using the waterproof case in saltwater, rinse it thoroughly with fresh water and let it air dry.
- Regularly check the O-ring seal for any debris or damage. Clean and lubricate the O-ring if necessary to maintain its waterproof integrity.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Camera does not power on. | Low battery; SD card issue; Firmware error. | Charge the battery fully. Remove and reinsert the SD card. If issue persists, perform a factory reset (refer to the full manual for instructions). |
| Video footage is shaky. | Image stabilization (EIS) is off; Excessive movement. | Ensure 6-axis EIS and Horizon Steady are enabled in settings. Minimize sudden movements during recording. |
| Cannot connect to smartphone via Wi-Fi. | Wi-Fi is off; Incorrect password; App issue. | Enable Wi-Fi on the camera. Verify Wi-Fi password. Restart the app and camera. |
| Poor video quality in low light. | Insufficient lighting; Settings not optimized. | Ensure adequate lighting. Adjust ISO or exposure settings if available. |
| SD card error. | Incompatible card; Card full; Card corrupted. | Use a recommended Class 10 or U3 microSD card. Format the card in the camera. Replace the card if corrupted. |
For further assistance, please contact SJCAM customer support.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | SJCAM |
| Model Number | C400 |
| Photo Sensor Technology | CMOS (1/2.8-inch) |
| Video Capture Resolution | 4K (30fps), 2.5K, 1080P |
| Lens Aperture | f/2.0 |
| Field of View (FOV) | 154 degrees (Ultra-wide-angle) |
| Image Stabilization | 6-axis Gyro (EIS) with Horizon Correction |
| Waterproof Depth | 30 meters (98 feet) with included case |
| Battery Life | Approx. 460 minutes (7+ hours) at 4K30fps (with handle) |
| Connectivity | 5G Wi-Fi, USB Type-C, Bluetooth |
| Display | Front 1.3-inch Touch Screen, Main 2.2-inch Touch Screen (on handle) |
| Storage | MicroSD card (Class 10/U3, up to 128GB) |
| Product Dimensions | 3.8 x 3.8 x 14 cm |
| Weight | 770 g (with handle) |
8. Warranty and Support
8.1 Warranty Information
The SJCAM C400 C400Pocket 4K Vlog Camera comes with a 1-year free warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use. Please retain your proof of purchase for warranty claims.
8.2 Customer Support
For any technical issues, questions, or warranty claims, please contact SJCAM customer support. Online support is available 24 hours a day to provide prompt assistance.
For the latest support information and contact details, please visit the official SJCAM website or refer to the contact information provided with your product packaging.





