Updated November 2026
Data from the official Eufy and Reolink sites.
2026 verdict
Panorama or pan-tilt? Where there is an outlet, the Reolink Duo 3 WiFi is the better outdoor security camera, with a 180 degree two-lens view and a more robust connection.
It joins 2.4 or 5 GHz Wi-Fi or plugs into Ethernet, is rated IP67 against IP65, carries a 2-year warranty against 1 year, costs less and is the better reviewed of the pair. The Eufy Cam S4 wins on placement: it runs on battery with solar charging, adds 32GB of built-in storage on top of microSD, works with Alexa, and uses a pan-tilt telephoto lens to follow movement next to its fixed wide view. Both record 4K with color night vision, offer RTSP and need no subscription. Choose the Reolink Duo 3 WiFi for a wall with power, and the Eufy Cam S4 for a spot you cannot wire.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
Works with
Connectivity
- Wi-Fi 2.4/5 GHz
- Ethernet
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| Feature | Eufy Cam S4 | Reolink Duo 3 WiFi | Winner |
|---|---|---|---|
| Warranty | 1 year | 2 years | Reolink Duo 3 WiFi |
| Weather Resistance | IP65 | IP67 | Reolink Duo 3 WiFi |
| Solar Charging | YES | NO | Eufy Cam S4 |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi, 5 GHz WiFi, Ethernet | Reolink Duo 3 WiFi |
| Storage | Internal, MicroSD Card Slot, Cloud | MicroSD Card Slot, Cloud | Eufy Cam S4 |
| Alerts | Motion, People, Animals, Vehicles, Familiar Faces | Motion, People, Animals, Vehicles | Eufy Cam S4 |
| Multiple Lenses | Triple (fixed wide + dual-lens pan-tilt zoom) | Dual (180° panoramic) | Tie |
| Rating | 4.2 | 4.2 | Tie |
| PoE | NO | NO | Tie |
| 2K Video | YES | YES | Tie |
| 4K Video | YES | YES | Tie |
| Color Night Vision | YES | YES | Tie |
What the differences mean
How it covers the scene
The Reolink Duo 3 WiFi stitches two lenses into one fixed 180 degree picture, so nothing moves and nothing is missed across a wide yard. The Eufy Cam S4 has a 130 degree wide lens plus a telephoto that pans 355 degrees to follow and zoom on movement.
Power
The Reolink Duo 3 WiFi needs a 12V outlet and has no battery. The Eufy Cam S4 runs on its battery with built-in solar charging, or wired, so it can go on a fence or tree far from any socket.
Network
The Reolink Duo 3 WiFi joins 2.4 or 5 GHz Wi-Fi and also has an Ethernet port. The Eufy Cam S4 is 2.4 GHz only, which its owners notice on crowded networks.
Storage
The Eufy Cam S4 carries 32GB of built-in memory plus a microSD slot, so it records out of the box. The Reolink Duo 3 WiFi has no internal memory and records to a microSD card you add, or to a Reolink NVR.
Build and warranty
The Reolink Duo 3 WiFi is rated IP67 and covered for 2 years; the Eufy Cam S4 is IP65 with 1 year. Both handle rain, but the Reolink is sealed against heavier exposure.
Which one to buy if
- you can run power to the spot and want the whole yard in one frame
The Reolink Duo 3 WiFi shows 180 degrees at once on steady mains power.
- there is no outlet where the camera has to go
The Eufy Cam S4 runs on battery and charges itself from the sun.
- you use Alexa
The Eufy Cam S4 works with Alexa; the Reolink Duo 3 WiFi does not.
- your Wi-Fi is congested or you want a wired option
The Reolink Duo 3 WiFi has 5 GHz Wi-Fi and an Ethernet port, where the Eufy is 2.4 GHz only.
$349.99
- + Solar Charging: YES
- + Storage: Internal, MicroSD Card Slot, Cloud
- + Alerts: Motion, People, Animals, Vehicles, Familiar Faces
- - Warranty: 1 year vs 2 years
- - Weather Resistance: IP65 vs IP67
Winner
- + Warranty: 2 years
- + Weather Resistance: IP67
- + Connectivity: 2.4 GHz WiFi, 5 GHz WiFi, Ethernet
- - Solar Charging: NO vs YES
- - Storage: MicroSD Card Slot, Cloud vs Internal, MicroSD Card Slot, Cloud
What owners say
Owners of both cameras praise sharp 4K-class footage, color night vision and the freedom of local storage with no monthly fee. Eufy Cam S4 owners single out the dual-lens tracking, where one lens holds the scene while the other zooms and follows, plus solar charging that keeps the battery topped up and responsive Eufy support; they complain about dropouts on busy 2.4 GHz networks, a heavy app and inconsistent vehicle detection. Reolink Duo 3 WiFi owners talk about a 180 degree view with almost no fish-eye that replaces two cameras and a Wi-Fi 6 link that stays stable at distance, while their warnings are grainy detail when zooming on distant subjects, a first setup that sometimes has to be done over Ethernet and a body that runs warm in hot climates.
Frequently Asked Questions
Which is better: Eufy Cam S4 or Reolink Duo 3 WiFi?
The Reolink Duo 3 WiFi, as long as you have power at the mounting spot. It offers a 180 degree view, dual-band Wi-Fi plus Ethernet, IP67 sealing and a 2-year warranty for less money. The Eufy Cam S4 is better where you need battery and solar power, Alexa or a pan-tilt zoom.
Is Eufy or Reolink better for a wide outdoor view?
The Reolink Duo 3 WiFi shows a fixed 180 degree panorama at all times. The Eufy Cam S4 covers 130 degrees with its wide lens and uses a second pan-tilt lens to follow and zoom, which reaches further but only in one direction at a time.
Do the Eufy Cam S4 and Reolink Duo 3 WiFi need a subscription?
No. The Eufy Cam S4 records to 32GB built in or microSD, and the Reolink Duo 3 WiFi to microSD or a Reolink NVR. Both also support RTSP for third-party recorders.
Can the Eufy Cam S4 and Reolink Duo 3 WiFi run on battery?
Only the Eufy Cam S4, which has a rechargeable battery with solar charging and can also be wired. The Reolink Duo 3 WiFi is plug-in only, with no battery or PoE.
Who should buy the Eufy Cam S4?
Homeowners who need a 4K camera where there is no power, want built-in storage and Alexa support, and like a telephoto lens that tracks and zooms on movement.
Who should buy the Reolink Duo 3 WiFi?
Anyone covering a wide driveway or yard from a wall with power, who wants a fixed 180 degree 4K view, a strong dual-band or wired connection and a longer warranty.
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