Quick answer
If you already own a eufy NVR System S4 Max, the PoE Cam S4 Add-On is a cost-effective way to add a 2-in-1 bullet-PTZ camera with auto-tracking to your existing setup.
Why expand instead of buying a new system?
The eufy NVR System S4 Max comes with a 4 TB HDD and supports up to 8 PoE cameras. Adding the PoE Cam S4 Add-On lets you cover more areas without replacing your recorder or paying for a second NVR. This is especially useful for large properties where one camera cannot monitor every blind spot.
What you lose with the add-on
The PoE Cam S4 Add-On requires the eufy Network Video Recorder S4 to operate—it cannot function as a standalone camera. Also, its lower 2K PTZ camera has 8x zoom, which is less powerful than the 4K wide-angle lens on the main system camera. If you need maximum resolution in every view, the add-on may not be the best fit.
Decision rules for expanding your eufy NVR
- Compatibility check: The PoE Cam S4 Add-On only works with the eufy Network Video Recorder S4 (included in the S4 Max system). It does not work with older eufy NVR models or standalone recorders.
- Coverage expansion: Use the add-on to monitor a separate area, such as a side yard or garage, while keeping the main camera on your front door. The add-on’s auto-tracking and 360° PTZ cover blind spots the main camera cannot see. Plan camera placement so the add-on covers a zone the main camera does not.
- Resolution trade-off: The add-on’s PTZ camera records in 2K, not 4K. If you need 4K detail in every tracked shot, consider adding another NVR system camera instead of the add-on. For license plate or facial recognition at a distance, the 4K main camera is better.
Product facts
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eufy 4K NVR Security Camera System S4 Max, 4 TB HDD: The S4 Max includes a 4K Triple-Lens Bullet-PTZ camera with a 122° fixed view and a 2K PTZ camera with 8× auto-zoom and 360° coverage, plus a 4 TB HDD. This gives you a wide overview and a zoomed-in tracking view from a single camera, making it ideal for monitoring large entryways or driveways.
eufy 4K NVR Security Camera System S4 Max, 4 TB HDD
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eufy PTZ-Bullet PoE Cam S4 Add-On: The PoE Cam S4 Add-On is a 2-in-1 16 MP Triple-Lens Bullet and PTZ camera with 8× auto-zoom and 360° coverage, but it requires the eufy Network Video Recorder S4 to operate. It replicates the dual-view tracking of the main system camera, so you get consistent coverage expansion without needing a separate recorder.
eufy PTZ-Bullet PoE Cam S4 Add-On
Who should expand?
Best for
- Homeowners who already own the eufy NVR System S4 Max and need to cover one additional area
- Users who want auto-tracking and 360° coverage in a second zone without buying a new recorder
Not for
- Anyone who does not yet own a eufy NVR System S4 Max—they need the full system first
- Users who require 4K resolution on all camera feeds, as the add-on’s PTZ is 2K
