eufyCam S3 Pro vs eufyCam S4: Which 4K Outdoor Camera Should You Buy?

Quick Answer

If you want a wire-free, battery-powered 4K camera with easy DIY installation and no monthly fees, the eufyCam S3 Pro is your best bet. If you prefer continuous recording, a constant power source, and don't mind running Ethernet cables, the eufyCam S4 (as part of a PoE NVR system) offers more robust 24/7 surveillance and advanced AI tracking. Choose based on your power preference and recording needs.

When you're shopping for a 4K outdoor security camera, the choice often comes down to how you want to power it and how you want to store footage. The eufyCam S3 Pro represents the battery-powered, wire-free approach that many homeowners love for its easy installation and flexibility. The eufyCam S4, typically sold as part of a PoE NVR system, takes a more traditional route with wired power and continuous recording.

Both cameras deliver sharp 4K video, but they're built for different lifestyles. In this comparison, we'll walk through the key differences—power, storage, smart features, and installation—so you can decide which one fits your home security setup without paying for features you don't need.

Power and Installation: Battery vs. PoE

The biggest difference between these two cameras is how they get power and connect to your network. The eufyCam S3 Pro runs on a rechargeable battery, so you can place it almost anywhere—on a porch, under an eave, or in a far corner of your yard—without worrying about running cables. Installation takes minutes: mount it, pair it with the HomeBase, and you're done. The trade-off is that you'll need to recharge the battery every few months, depending on activity and settings.

The eufyCam S4, on the other hand, is a Power over Ethernet (PoE) camera that receives both power and data through a single Ethernet cable. That means you'll need to run cables to the camera location, which may require drilling holes, routing through walls, or hiring an installer. In return, you get a constant, reliable power source and a stable wired connection—ideal for continuous recording without worrying about battery drain.

Consider your tolerance for maintenance and installation effort. If you prefer a quick, DIY setup and flexibility to move cameras later, the S3 Pro's battery convenience is hard to beat. If you're fine with a more permanent installation and want uninterrupted recording, the S4's PoE connection is the way to go.

• If you rent or don't want to drill many holes, a battery camera like the S3 Pro is easier to install and remove.
• For permanent setups where you can run cables, PoE (S4) eliminates battery worries and Wi-Fi interference.

Recording and Storage: Continuous vs. Event-Based

Battery-powered cameras like the eufyCam S3 Pro typically record events (motion-triggered clips) to conserve power. The S3 Pro can store footage locally on a HomeBase (sold separately) with no monthly fees, and it also supports cloud storage if you choose. Event-based recording means you'll capture the important moments—like a person walking up your driveway—but you won't have a continuous footage stream to scroll through.

The eufyCam S4, when paired with an NVR like the eufy PoE NVR Security System S4, can record 24/7 to a hard drive. This gives you a complete, time-stamped record of everything that happens in view, which can be crucial for reviewing incidents that don't trigger motion detection, like a package sitting there for hours or a vehicle slowly passing by. The NVR also provides a built-in storage solution, so you don't need to manage separate microSD cards or cloud plans.

If you want to be able to rewind and see exactly what happened at any time, continuous recording with the S4 is a significant advantage. If you're okay with only seeing motion-triggered events—and want to save on storage—the S3 Pro's event-based clips are usually sufficient, especially with its smart detection features.

• Check if your S3 Pro bundle includes a HomeBase; that's where local storage happens.
• NVR systems (like the S4 bundle) typically come with a hard drive, so you don't need to buy extra storage.

Smart Features and AI: What's Different?

Both camera lines use eufy's AI to distinguish between people, pets, and vehicles, reducing false alerts. The eufyCam S3 Pro uses on-device AI that works without a subscription, so you can get alerts for people and vehicles without paying a monthly fee. It also has a built-in spotlight and siren to deter intruders.

The eufyCam S4, especially when part of a PoE NVR system, benefits from the NVR's 'Local AI Agent' capabilities. The NVR can process video analytics for multiple cameras, enabling advanced features like auto-framing and group tracking. For example, the eufy PoE NVR Security System S4 includes cameras with 8× zoom and 360° pan to automatically follow a subject. This is a level of intelligence that battery cameras often can't match because of power constraints.

So, if you want a camera that can actively track a person across your yard, the S4's AI is more capable. If you just want smart alerts and a deterrent light, the S3 Pro's built-in AI is more than enough for most homes.

• On-device AI on the S3 Pro means no monthly fees and privacy-focused local processing.
• The NVR's AI can coordinate multiple cameras, but you need a full system to get that advantage.

Key Tradeoffs to Consider

• Installation effort: eufyCam S3 Pro: no wiring, just mount and pair. eufyCam S4: requires running Ethernet cables, which may need drilling and professional help. Trade-off: convenience vs. permanence. If you're not handy or want to move cameras, choose S3 Pro; if you own your home and want a fixed system, S4 is worth the effort.
• Recording type: S3 Pro records events (motion clips) to conserve battery. S4 records 24/7 to a local NVR hard drive. Trade-off: potentially missing non-motion events vs. having a full timeline. If you need continuous footage for peace of mind, S4; if event clips suffice and you want to save storage, S3 Pro.
• Smart tracking capability: S3 Pro has AI detection but no PTZ. S4 with PTZ cameras can auto-track subjects with 8× zoom and 360° pan. Trade-off: basic alerts vs. active response. If you want a camera that follows a person across the yard, S4; if you only need alerts and a spotlight, S3 Pro.

Product Facts and Why They Matter

• eufy PoE NVR Security System S4 Max + 2 PoE Cam S4 Add-Ons: Limited-Time Free Gift: Get a Bullet PoE Cam E40 Add-On Triple-Lens Bullet-PTZ Camera in 4K Max View: The upper 4K wide-angle lens delivers a 122° fixed view of the area, while the lower 2K Pan-Tilt-Zoom lenses feature 8× auto-zoom and 355° pan for complete coverage. Note: To ensure seamless security, update your eufy app to version 5.0.71 or above. This bundle gives you a powerful 4K fixed view plus a PTZ camera that can zoom and pan to follow activity, making it ideal for large yards where you need both wide coverage and the ability to zoom in on details.
• eufy PoE NVR Security System S4: The Ultimate 4-Cam System: Safeguard every corner with two 4K turret cameras for key areas, two bullet-PTZs for a wide 4K view, and one 2K PTZ for 8× zoom and seamless 360° coverage for intelligent, active monitoring. Powered by AI-ISP for vibrant color and enhanced low-light visibility. This system provides a mix of fixed and PTZ cameras, giving you 360° coverage and 8× zoom, so you can keep an eye on every corner and zoom in to identify faces or license plates without losing detail.

How to Choose

Best for

• Homeowners who want a simple, wire-free install and don't mind recharging batteries occasionally.
• Renters or those who may move and want a portable security solution.

Not for

• Those who need continuous 24/7 recording without gaps.
• People who want active PTZ tracking and don't want to run cables.

In the end, the eufyCam S3 Pro and eufyCam S4 serve different security needs. The S3 Pro offers easy, battery-powered installation with event-based recording and smart alerts—perfect for most homes. The S4, especially when paired with an NVR, delivers continuous recording and advanced AI tracking for a more comprehensive, always-on system. Assess your willingness to run cables and your need for continuous footage, and you'll find the right fit.