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Eufy Video Doorbell C31
Bullet Camera with 4.9MP (2560×1920) resolution, 80° field of view, and 0m IR night vision range.
SPECIFICATIONS · VIDEO DOORBELL C31
Specifications
About the Eufy Video Doorbell C31
The Eufy Video Doorbell C31 is a rugged outdoor-grade bullet form factor designed to withstand exposure to weather, vandalism, and direct sunlight. At 5-to-6MP the sensor sits between 1080p economy and 4K forensic detail: enough pixels-per-metre for evidence-grade faces at typical entrance and driveway distances, while keeping recording bitrate materially lighter than an 8MP camera. There is no built-in IR illuminator on this model, so it depends entirely on ambient light. In dark environments, pair it with external IR floods or white-light illuminators. A wide 80–120° angle covers a large room or open area from a single mounting position, making it ideal for retail floors, conference rooms, and small parking lots.
Best use cases for this camera
Entrance, lobby & vestibule
The 80° field of view captures the entire entrance and surrounding waiting area from a single ceiling mount. Useful for capturing visitors as they enter and leave.
Strengths
- •4.9MP sensor preserves detail under digital zoom on recorded footage
Considerations
- •No built-in IR — requires external illumination for night use
Coverage at Different Distances
| Distance | Coverage Width | Coverage Area | Use Case |
|---|---|---|---|
| 5m | 8.4m | 42 m² | Entrance, corridor |
| 10m | 16.8m | 168 m² | Room, retail aisle |
| 15m | 25.2m | 378 m² | Warehouse, parking row |
| 20m | 33.6m | 671 m² | Parking row, courtyard |
| 30m | 50.3m | 1510 m² | Parking lot, yard |
| 50m | 83.9m | 4195 m² | Perimeter, large area |
Field of View Visualization
Night Vision Performance
Daytime
Full 4.9MP (2560×1920) resolution at 80° field of view. Effective identification range up to 20m in good lighting conditions.
Nighttime (IR)
Built-in IR LEDs illuminate up to 0m in complete darkness. Switches to B/W mode for clear night footage.
Installation tips for the Video Doorbell C31
Position so the most important subject (entrance, cash register, gate) is in the center third of the frame — peripheral pixel density drops with wide angles.
Plan storage at roughly 20 GB per camera per day for continuous H.265 recording at 15fps — verify NVR has sufficient HDD bay capacity.
Coverage geometry & DORI distances
At a 5-metre standoff the Eufy Video Doorbell C31 covers about 8.4 m of scene width; at 10 m that grows to 16.8 m, and at 20 m to 33.6 m. Translating those numbers through EN 62676-4 pixel-density thresholds, the camera can detect a person up to 70 m, observe up to 28 m, recognise up to 14 m, and produce identification-grade detail (the ≥250 px/m bar used by Polish and EU courts as evidentiary) up to 7 m. Effective range above the identify threshold relies on supplementary lighting or a longer-focal-length optic — the geometry above assumes the fixed lens declared by the manufacturer.
Power & cabling
The Eufy Video Doorbell C31 draws an estimated 5.5 W under typical load (with the IR illuminator engaged where applicable), placing it in the 802.3af (Class 3, ≤15.4 W) budget. A single switch port supplies enough power without an injector. Cabling: stick to Cat6 STP for runs up to 100 m end-to-end — beyond that, add an inline PoE extender or move to fibre with a media converter at the camera end. On outdoor runs, route through ø25 PVC or PE conduit to keep the cable shielded from UV and rodents.
Privacy & legal (GDPR / RODO)
Any camera operating in a publicly accessible area falls under GDPR (RODO in Poland) — Art. 13 obliges the data controller to post an information sign at every entry point with controller name, DPO contact, lawful basis (typically Art. 6(1)(f) legitimate interest for property protection), purpose, and retention period. Even a narrowly-aimed bullet camera can incidentally record passers-by, so the Art. 13 sign at the entry point applies regardless of how tightly the lens is framed.
Installer time & cost (rough estimate)
A typical EU installer quotes 3–4 h of labour per bullet camera of this class (approximately €135–€185 excluding hardware), broken down as bracket mounting, cable termination at both ends, on-site commissioning, and a brief operator handover. Allow extra time for high mounts (>4 m), exterior installations requiring scaffolding, or sites where cable routing demands wall penetrations or conduit work.
Indicative EU 2024-2025 pricing — actual quotes vary by region, mounting height, and site conditions. Excludes hardware, transport, permits, and VAT.
Frequently asked questions
Is the Eufy Video Doorbell C31 suitable for outdoor installation?
Yes for the IP66/IP67-rated variant of this model. Bullet and dome bodies in the Eufy range survive direct rain, snow and UV; check the IP / IK rating against your environment (IP66 for rain/dust, IK10 for vandal-prone locations).
What PoE class powers the Eufy Video Doorbell C31?
The camera draws roughly 5.5 W in steady-state operation, requiring a 802.3af (Class 3, ≤15.4 W) switch port. A single Cat6 STP cable carries both data and power up to 100 m — beyond that, add an inline extender or convert to fibre near the camera.
How much storage does the Eufy Video Doorbell C31 consume per day?
At 4.9MP (2560×1920) resolution, 15 fps H.265 continuous recording, the Video Doorbell C31 produces approximately 20 GB per day — about 600 GB per month. Motion-only or event-triggered recording typically cuts that by 40–70 % depending on scene activity. Plan NVR HDD capacity for the longest retention period required by your privacy policy or insurance contract.
Up to what distance can the Eufy Video Doorbell C31 identify a person?
Per EN 62676-4:2025 pixel-density thresholds, this camera identifies (≥ 250 px/m on the target) up to about 7 m, recognises a person up to 14 m, observes general activity up to 28 m, and detects motion up to 70 m. Identification distance assumes daylight or full IR illumination on the target — at the limits of the IR cone the effective identify distance shrinks roughly 30 %.
What network bandwidth does Eufy Video Doorbell C31 use?
Typical ingest is 7 Mbps for the main stream (H.265, medium scene complexity, 15 fps) plus ~0.5 Mbps for a low-resolution sub-stream used by mobile clients. For a 16-camera installation of this class, plan a 50–100 Mbps NVR uplink and a dedicated VLAN for camera traffic.
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