Most outdoor cameras make you pick your compromise: sharp but wired, wire-free but subscription-bound, weatherproof but fixed and blind to half the yard. The eufy SoloCam S340 is notable because it refuses most of those trade-offs at once — it charges itself from the sun, it moves to follow what it sees, it carries the toughest weather rating in its class, and it saves your footage without ever asking for a monthly fee. This review is about how well that combination holds up, using only eufy's published specifications.
The dual camera that actually follows motion
The S340's headline feature is not just its 3K resolution — it is that there are two cameras in one body. A wide lens watches the whole scene, and a second telephoto lens zooms in to follow and frame a subject as it moves. Mounted on a 360-degree pan-and-tilt head, the camera physically turns to keep a person or a car in view rather than watching them walk out of a fixed frame. The practical effect is that a single S340 can cover ground that would otherwise take two fixed cameras — a full frontage, a driveway and the path to the door — which is a large part of why it tops our best outdoor security cameras ranking.
That pan-tilt-zoom behavior is the S340's clearest advantage over a conventional wide-angle camera, and it is exactly the axis on which it is most often compared to its closest rival. If a wide yard is your specific problem, the Reolink Argus 4 Pro vs eufy SoloCam S340 comparison puts the eufy's moving dual-lens approach against the Reolink's fixed ultra-wide 4K lens, because those are the two credible ways to solve "watch everything with one camera."
Solar power and the set-and-forget promise
The S340 pairs a rechargeable battery with an integrated solar panel. In a mounting spot that gets good sun, that combination effectively means you never recharge it — the panel tops the battery back up faster than normal use drains it, and the camera simply runs. That is the real prize of a solar camera: not just no wiring, but no maintenance. You are not hunting for an outlet, and you are not bringing it down every few months to charge.
The honest asterisk is the same one every solar camera carries: the sun has to actually reach it. A north-facing wall in permanent shade, a spot under a deep eave, or a long stretch of grey winter will slow the charging, and on a very busy camera that records constantly the battery can still lose ground. Mount it where it sees sky and sun and it is close to genuinely set-and-forget; mount it in the shade and you are back to occasional recharging. Pick the spot with the panel in mind, not just the camera's view.
Storage — 8GB built in, and genuinely no monthly fee
This is where the S340 earns its keep on cost. It has 8GB of storage built into the camera itself, and it records event clips straight to that memory with no subscription required. There is an optional cloud plan, but it is genuinely optional — the camera does its core job, saving and replaying your motion clips, with nothing but the hardware you already bought. That is why it leads our best no-subscription cameras page as well as the outdoor roundup: over three years, the cameras that make you rent access to your own footage quietly cost far more than the ones that don't, and the eufy sits firmly in the second camp.
The honest limit is capacity. 8GB is a fixed, modest amount of storage, and on a busy camera that records dozens of events a day it will fill — at which point the oldest clips are overwritten to make room for new ones. For most homes that is fine: you review recent events and rarely need footage from three weeks ago. But if you want a long, guaranteed history, you either manage the storage actively or add the optional cloud. It is a real constraint, and it is the flip side of no fee — you trade unlimited cloud history for zero monthly cost.
Weatherproofing: IP67, the top of the class
The S340 carries an IP67 rating, which is the highest weather rating you will find among mainstream outdoor cameras. The 6 means it is fully dust-tight; the 7 means it is rated to survive temporary immersion in water, not merely to shrug off jets and spray. In plain terms, this is a camera you can put on a fully exposed wall and stop worrying about — driving rain, dust, snow, none of it is a concern within the rated conditions. Among the field in our outdoor roundup, nothing here is tougher on paper.
Night vision is in color, thanks to an integrated spotlight rather than the black-and-white infrared that budget cameras fall back to. Color at night is a meaningful upgrade: it is the difference between "a figure moved" and "a person in a red jacket," which is exactly the detail that matters when you are reviewing an event after dark. Two-way talk is included, so you can hear and speak through the camera from the app.
Ecosystem: Alexa and Google, but not Apple or Matter
The S340 works with both Amazon Alexa and Google Home, which is a step broader than the Alexa-only cameras it competes with — you can pull the feed onto an Echo Show or a Nest Hub either way. What it does not do is Apple HomeKit Secure Video, and it does not support Matter. In day-to-day use you live in the eufy app, with Alexa or Google as the voice layer on top. For the large majority of buyers that is completely fine. For an Apple household that wants its cameras inside the Home app, it is a hard stop — and it is the single most common reason to pass on an otherwise excellent camera.
The honest downsides
Three things keep the S340 from being a camera for literally everyone. First, that 8GB of built-in storage fills on a busy camera and overwrites the oldest clips, so a long history means managing it or paying for optional cloud. Second, there is no Matter and no HomeKit, so Apple-first homes are out. Third, it is a substantial, visible piece of hardware — the pan-tilt head and dual lens make for a camera that announces itself on a wall rather than tucking away discreetly. None of these are dealbreakers for the buyer it is built for, but they are real, and you should know them going in.
Everyday use: alerts, tracking and the app
Day to day, the S340 lives in the eufy app, and the experience is built around its moving dual lens. When something triggers it, the camera pans, tilts and zooms to keep the subject framed, and the clip it saves shows the motion tracked across the scene rather than a figure drifting out of a fixed rectangle. Color night vision from the built-in spotlight means those after-dark clips carry the detail — clothing, a vehicle's color — that grey infrared throws away, and two-way talk lets you speak to whoever is on camera straight from the app. Because the storage is on the camera itself, replaying a recent event does not depend on a cloud round-trip or a paid tier; you open the app and scroll the clips it has kept. The one habit worth forming is keeping an eye on that 8GB: on a busy camera it fills and overwrites, so if a particular clip matters, save or export it before newer events push it out. Set up that way, the S340 is a low-fuss camera that mostly looks after itself.
The verdict
The eufy SoloCam S340 is the most complete outdoor camera we have researched for a typical home, and it earns that by refusing the usual compromises. It charges from the sun, so you forget about it. It moves to follow motion in 3K, so one camera watches what two normally would. It carries the best weather rating in its class. And it saves every clip to built-in storage with no monthly fee, which over years is the difference-maker on cost. Its limits are honest and narrow: a fixed 8GB of local storage, no Apple or Matter support, and a visible body. If none of those three is a dealbreaker — and for most homes none is — this is the outdoor camera to beat, and the one we point most buyers toward first.
