1. Introduction
The eufy Security Video Doorbell Camera C31 offers advanced home security with 2K FHD video quality and flexible power options. This manual provides detailed instructions for installation, operation, and maintenance to ensure optimal performance of your device.

Figure 1: eufy Security Video Doorbell Camera C31 with live video call on smartphone.
2. Setup
2.1. Initial Preparation
- Charge the Battery: Fully charge the quick-release 6500mAh battery using the provided USB-C cable before installation.
- Insert SD Card (Optional): If local storage is desired, insert a compatible microSD card (not included) into the designated slot.
- Download eufy Security App: Download and install the eufy Security app from your device's app store. Create an account or sign in.
Video 1: Official eufy guide on how to install the Video Doorbell C31, covering battery charging, SD card insertion, and app setup.
2.2. Mounting Options
The eufy Security Video Doorbell C31 offers both battery-powered and hardwired installation options.

Figure 2: Illustration of dual power options: battery or hardwired installation.
2.2.1. Battery-Powered Installation
- Placement: Choose a location that provides a clear view of your desired monitoring area. The recommended height for installation is 4.2 feet (1.2 meters) off the ground.
- Mounting: Secure the mounting bracket to your wall using the provided screws. Align the doorbell with the bottom of the mounting bracket, then press the top of the doorbell into place until it clicks.
- Battery Life: The quick-release rechargeable 6500mAh battery provides up to 120 days of surveillance on a single charge, depending on usage and environmental factors.

Figure 3: Quick-release battery pack for easy charging and installation.
2.2.2. Hardwired Installation
For continuous power and 24/7 recording, hardwire the doorbell to your existing doorbell wiring. This requires a DIY installation process, including bypassing your existing chime.
- Safety First: Always turn off the power at the circuit breaker before beginning any wiring.
- Wiring: Connect the doorbell to your existing doorbell wires. Ensure the quick-release battery is inserted into the doorbell for proper function, even when hardwired.
- Chime Bypass: Your existing chime needs to be bypassed to ensure proper functionality and continuous recording. Follow the specific instructions provided in the full manual for bypassing your chime.
- Continuous Recording: Hardwiring enables continuous 24/7 recording and 5-second pre-roll for motion-activated events.

Figure 4: 24/7 non-stop surveillance is available with hardwire power.
3. Operating Instructions
3.1. Live Video and Communication
- 2K FHD Clarity: Experience crystal-clear 2K FHD video with a 4:3 aspect ratio, providing a wider, head-to-toe view of visitors.
- Real-Time Chat: When someone rings the doorbell, a pop-up video call appears on your phone, allowing for instant two-way communication.
- Quick Responses: Set up pre-recorded quick responses or allow visitors to leave voice messages if you are unavailable.

Figure 5: Enhanced clarity with 2K FHD resolution.

Figure 6: 4:3 Expanded View provides a more complete picture.
3.2. Motion Detection and Recording
- Human Detection: The doorbell features human detection to reduce false alerts from non-human objects.
- Local Storage: All footage is securely stored locally on an SD card (up to 128GB expandable) without any monthly fees.

Figure 7: Local storage eliminates the need for monthly subscription fees.
3.3. Smart Home Integration
The eufy Security Video Doorbell C31 is compatible with various smart home ecosystems:
- HomeBase 3: Pair with the eufy HomeBase S380 (sold separately) for extended storage and enhanced AI detection features.
- Voice Assistants: Works with Alexa and Google Voice Assistant devices for convenient voice control and live video streaming to compatible smart displays.
4. Maintenance
- Battery Charging: For battery-powered installations, remove the quick-release battery pack and charge it using the USB-C cable when the battery level is low.
- Weather Resistance: The doorbell is IP65 weatherproof, ensuring non-stop operation in extreme temperatures from -4°F to 122°F (-20°C to 50°C).
- Cleaning: Periodically clean the camera lens and the doorbell's exterior with a soft, damp cloth to maintain optimal video clarity.
5. Troubleshooting
- Poor Motion Detection: Adjust the motion detection sensitivity settings within the eufy Security app. Ensure activity zones are correctly configured to cover relevant areas and exclude high-traffic zones like public sidewalks.
- SD Card Not Recording: Verify that the SD card is properly inserted and formatted within the app. Ensure the battery is sufficiently charged or the doorbell is hardwired for continuous recording.
- Lens Fogging/Cover Issues: Ensure the lens cover is securely in place and clean. If the cover is damaged or detached, contact eufy support for assistance.
- Delayed Notifications/Communication: Check your Wi-Fi signal strength at the doorbell's location. A strong, stable Wi-Fi connection is crucial for real-time alerts and two-way audio/video.
6. Specifications
| Model Number | T8223-Renewed |
| Connectivity Protocol | Wi-Fi |
| Connectivity Technology | Wireless |
| Video Resolution | 2K FHD |
| Power Source | Battery Powered (6500mAh quick-release) or Hardwired |
| Battery Life | Up to 120 days (variable based on usage) |
| Weather Resistance | IP65 |
| Local Storage | MicroSD card (up to 128GB, not included) |
| Dimensions (L x W x H) | 5.83 x 2.07 x 1.23 inches |
| Item Weight | 14.1 ounces (0.4 Kilograms) |
| Included Components | Doorbell battery |
7. Warranty and Support
For warranty information, product support, or technical assistance, please refer to the official eufy Security website or contact their customer service directly. Keep your purchase receipt for warranty claims.
Online Support: Visit eufylife.com/support





