Product Library / Cameras & Doorbells

Protocols: WIFI^{[32][42][48][56]}

Plans and ongoing costs^{[5][19][25][29][42][43][48][49][56]}

✓ Works without a subscription: Yes.

Vendor account required: Not established — we have not sourced this yet.

eufy's product page for the S4 says 'No Monthly Fee' and 'Access all features with no hidden costs or interruptions, with 4 GB of built-in eMMC local storage', and its feature page lists 24/7 recording with no monthly fee. The 'No Monthly Fee' line carries an asterisk, and the footnote it points to does not appear on the page as we read it. eufy sells a cloud-backup membership for its devices; these pages do not say whether it applies to the S4. One thing does pass through eufy's servers: eufy says the thumbnail images in push notifications are stored in the cloud temporarily.

Maintenance and offline use

• Works without the internet: Not established — we have not sourced this yet. It does not mean the product fails without the internet.
• Wired only. eufy says the S4 connects to existing doorbell wiring supplying 16 to 24 V AC at 10 to 40 VA, and that it does not support everyday battery or solar power. A built-in 2,600 mAh battery is there to keep it going through a power cut. eufy's fitting steps are: switch off power at the breaker, remove the old doorbell button, attach its wires to the S4, mount it and finish in the eufy app. The old mechanical chime is bypassed and the included Chime 2 rings instead. Recordings are kept on 4 GB of built-in storage, and eufy also describes continuous recording to a microSD card (not included) or a HomeBase S380 (sold separately). eufy recommends an upload speed of at least 8 Mbps for the 3K video.

Security updates^[10][36]

eufy publishes no security-update support date for this model. That is a gap in what the manufacturer has published, not evidence either way — some makers declare a support period and some say nothing at all.

eufy states that its products meet the UK's connected-device security rules, but publishes no date for how long it will issue security updates. The S4's own pages give no date either.

The catch

Two limits come from eufy's own pages. Apple Home needs a eufy HomeBase S380, sold separately. And in Alexa, Google Home or Apple Home the S4 shows a fixed live view only: eufy says the VR view and the OmniTrack tracking it is sold on work in the eufy app alone. It is wired only. It needs existing doorbell wiring at 16 to 24 V AC, and the built-in battery is a backup for power cuts, not a way to run it. eufy's store lists it at $299.99 with the Chime 2 included, $20 above the price Anker announced in January 2026, and on 1 October 2026 it was a pre-order estimated to ship by the end of October. eufy says there is no monthly fee, with an asterisk the page does not explain. eufy's general doorbell support article still says HomeKit is not supported, which disagrees with the S4's own pages.

Who it's for

A home with existing doorbell wiring that wants a wide, sharp view of the doorstep recorded with no monthly fee, and that will mostly use eufy's own app. It fits Alexa and Google Home users who only need to pull up a live view. It is a weaker fit for an Apple Home household unless you own or will buy a HomeBase S380, and the wrong pick for a door with no doorbell wiring, because eufy says it does not run on battery day to day. eufy does not list SmartThings for it.

Sources & method

Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →

Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.