eufy Baby Monitor E21: problems, parts and running costs

Checked: 2026-10-06

Summary

The eufy Baby Monitor E21 (T8354) is a hybrid 4K baby monitor with a 5-inch 720p parent display, a physical Wi-Fi kill switch and no mandatory subscription. The main limitations are missing health monitoring and smart home integration; the pan-tilt motor is audible. It costs nothing per year beyond electricity and is a good buy at $180–$260.

Common problems and fixes

No breathing or health monitoring — design limitation, not a defect; no fix exists and warranty does not apply. If you need breathing or heart-rate monitoring, look at Owlet or Nanit instead. [5]
No smart home integration — the E21 does not work with Alexa or Google Home; design limitation, not a defect. [5]
Audible pan-tilt motor — the motor makes noise when the camera rotates; design limitation, not a defect. [5]
microSD card not included — local recording requires a microSD card (up to 128GB) that is not in the box; purchase one separately. [6]
Parent display is 720p, not 4K — the 4K resolution applies only to the camera feed; the 5-inch parent display is 720p. Design limitation, not a defect. [3][6]
800 ft range is a manufacturer claim — real-world range through walls will be lower. Design limitation, not a defect. [1]

Parts and consumables

microSD card (up to 128GB) — not included; purchase separately for local recording. No price or replacement interval reported. [2][6]

Yearly running cost

No subscription is required for core features [5][6]. The only consumable is a microSD card (up to 128GB) for local recording, which is not included [6]; this is a one-time purchase, not a yearly cost. Electricity cost is negligible. Yearly running cost is effectively $0 beyond the one-time microSD card purchase.

When it is a good buy

$180 at Walmart (2025) — strong buy for 4K video and local privacy. [6]
$260 at Target (2025) — fair price. [6]
$259.99 at eufy direct (2026) — full price. [1]

If you need breathing or health monitoring, Owlet or Nanit are better choices. [5]