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eufy Security Video Doorbell S4 (Chime Included)

eufy Security Video Doorbell S4 (Chime Included)

By eufy · Video Doorbells · Cleaning & Smart Home · More from eufy

  • 4K bullet + dual 2K PTZ resolution
  • 130-degree wide-angle lens
  • 360-degree PTZ with 8x hybrid zoom
  • Built-in 32GB storage expandable to 256GB
  • 5.5W solar panel included

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Used, refurbished, open-box

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Problems, parts and running costs

Summary

The eufyCam S4 is a three-lens outdoor security camera — a fixed 4K bullet plus a motorized dual-2K pan/tilt/zoom — that runs on a removable 10,000 mAh battery, an optional 5.5 W solar panel or wired USB-C power, with no required subscription. Check the name before you buy: the listing behind this page is titled “Video Doorbell S4”, but every specification on it belongs to this camera, and eufy sells a wired doorbell under the same S4 name.

Strengths

  • Three lenses in one housing: a fixed 4K bullet plus a motorized dual-2K PTZ with 8x hybrid zoom and 360° pan.
  • The 10,000 mAh battery is user-removable and charges outside the camera; a detachable 5.5 W solar panel can keep it topped up.
  • No subscription for local storage or the core AI features; Consumer Reports’ published attributes confirm the headline specs.

Weaknesses

  • Saved clips are not 4K: a stacked 2,688 x 3,040 file means each view is effectively 2,688 x 1,520 at 15 fps, and 2,150 x 1,216 with cross-camera merging.
  • 2.4 GHz Wi-Fi only, confirmed by eufy’s own spec table, Consumer Reports and the FCC agent letter.
  • 24/7 snapshots, cross-cam tracking, BionicMind face recognition and Fusion Link all require a HomeBase S380 that is not in the box.
  • The microSD card and the 5 V/2 A adapter that 24/7 recording needs are both sold separately.
  • Owners report a direct-power-mode defect: the battery drains and the camera shuts off, across a replacement unit, a new cable and 30 W, 100 W and 140 W bricks.

Verified specifications

ModeleufyCam S4, model T8172, retail SKU T81721W1; FCC ID 2AOKB-T8172.
Max resolutionbullet 4K (3840x2160); PTZ 2K + 2K (2688x1520).
Sensors1/2.8-inch stacked CMOS (bullet), 1/3-inch CMOS (PTZ), f/1.6 aperture.
Field of viewfixed wide D130° H107° V57°; PTZ wide D121° H102° V54°; PTZ telephoto D46° H40° V23°.
Zoom and movement8x hybrid zoom over a 3x optical telephoto; 360° pan, 0-70° tilt.
Night visionLED spotlights for color plus four 850 nm IR LEDs reaching 32.8 ft (10 m).
Audio and alarmfull-duplex two-way talk with dual mics and noise reduction; 105 dB siren.
EncodingH.264 / H.265 at up to 15 fps.
Storage32 GB built-in eMMC, expandable to 256 GB by microSD (card not inserted, not included); a card takes priority when present.
Batteryquick-swap 10,000 mAh Li-ion pack with its own USB-C port; full charge 6-8 hours from a 5 V/2 A charger.
Powerbattery or wired USB-C direct power; a 14 ft / 4.2 m cable kit is in the US box; 24/7 recording needs a 5 V/2 A or better adapter, not included.
Solardetachable 5.5 W SolarPlus 2.0 panel, charging from 2,500 lux; 3 m extension cable.
Wi-Fi802.11b/g/n/ax, 2.4 GHz only.
Motion detectionbullet PIR to 30 ft; PTZ radar to 40 ft.
Dimensions92 x 164.5 x 165 mm (305 mm with the tilted solar panel); camera approx. 745 g, panel approx. 308 g.
Low power drawat or below 0.5 W.
Feature gating24/7 smart snapshot, cross-cam tracking, BionicMind face recognition and Fusion Link require a HomeBase S380; Apple HomeKit is not supported on the camera.
Warranty12 months for security cameras; 30-day money-back on eufy-direct purchases.
In the box (US)camera, rechargeable battery, mounting bracket, positioning sticker, screw pack, USB charging cable, solar panel with bracket and extension cable, quick-start guide.
Full research notes and sources

Two products, one name

The listing behind this page is titled “eufy Security Video Doorbell S4 (Chime Included)”, but every key spec on it — the 4K bullet plus dual 2K PTZ, the 130-degree wide-angle lens, 360-degree PTZ, 8x hybrid zoom, 32 GB built in and expandable to 256 GB, the 5.5 W solar panel, IP65 — appears in eufy’s own specification table for the eufyCam S4 camera, model T8172. No video doorbell eufy sells has PTZ, a solar panel or an on-device microSD slot. The actual Video Doorbell S4 is a different product: a wired-only 9 MP, 3072 x 3072 (3K) unit with a 180° x 180° panoramic lens, radar plus dual PIR, power from existing doorbell wiring at AC 16-24 V, and Chime 2 in the box. Third-party coverage has the doorbell at $299.99 preorder with shipment estimated at the end of October 2026; CES 2026 coverage announced $249. This review covers the camera, because that is what the listed specifications describe; confirm which hardware arrives before you buy.

Clips are not 4K

eufy advertises a 4K bullet sensor, and it can record at that resolution, but the clip you download is not 4K. Two independent testers measured saved events as one stacked file at 2,688 x 3,040, each camera occupying half the frame, so every view is effectively 2,688 x 1,520 at 15 fps, and 2,150 x 1,216 once cross-camera merging is enabled. Nothing on the spec sheet discloses this. Setting motion and privacy zones is fiddly because the fixed and motorised cameras need separate setup, and L&B found BionicMind facial recognition wrong a few times.

Battery, solar and cold weather

The 10,000 mAh pack is user-removable with its own USB-C port, so a spare can charge outside the camera; a full charge takes 6-8 hours from a 5 V/2 A charger. The detachable 5.5 W panel is the nicer path if the mount gets sun: eufy says charging begins at 2,500 lux, T3 measured 100-200 mAh drawn per day against up to 270 mAh harvested, and L&B’s sunny test camera sat near 80% after two weeks while a shaded one went from 100% to 0% in 12 days. eufy’s Best Buy listing claims the panel collects 1,000-2,500 mAh/day in optimal sunlight while the camera uses 300-550 mAh/day. Placement dominates: a north-facing or shaded install will not sustain the camera.

Is it worth it?

The solo camera lists at $349.99 on eufy’s US site (checked 2026-10-16), up from the $299 it launched at in late 2025; the 2-cam kit is $799.99 and the 4-cam kit $1,399.99. If the gated features matter, the camera-plus-HomeBase-S380 bundle at $549.98 is the realistic entry point — T3’s deal widget showed it at $479.98 against the $549.98 reference. Expert Reviews flags the price against the Tapo C460 at around £100 and the Reolink Altas at around £110, and L&B puts it at roughly double the price per camera of the Imou Cruiser Dual Aurora (2,560 x 1,440 at 20 fps) for clearly better image. If 24/7 recording is the plan, price in the 5 V/2 A adapter and a microSD card, both sold separately, and weigh the direct-power defect above. A replacement battery is a €69.99 accessory on eufy’s EU storefront. There is no required subscription; local storage and the core AI features are free, and cloud backup is optional.

Which model this is

Model T8172, retail SKU T81721W1, FCC ID 2AOKB-T8172, sold through eufy’s US and EU stores and carried at Best Buy as the eufyCam S4 Triple-Lens Camera.

Do not confuse it with the Video Doorbell S4, which is a wired doorbell with a panoramic lens.

Sources

Manufacturer:

Independent reviews:

Owner reports:

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