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Imou S21FEP review

Imou states a 3 MP sensor, four night-vision modes including full colour, AI person and vehicle detection and a 110 dB siren, in a dual-antenna housing rated IP66. It sits between the budget cameras and the tracking models in price and in capability.

The bottom line The sensible middle of this hub: better detection than the budget cameras, without the price of a tracking model. The dual antennas matter more than the specification sheet suggests.

The S21FEP is the camera to look at when a cheaper one has already been switched off because it notified too often. Imou states AI person and vehicle recognition specifically to filter the triggers caused by insects and moving branches, and those two causes account for most of the notifications that make an outdoor camera unbearable in summer.

What it actually does

A 3 MP sensor gives 2304 × 1296, which is enough to tell a delivery from a visitor at the length of a drive. The head sweeps 355° and tilts 90°, with auto-tracking, and Imou lists four night-vision modes — infrared for a monochrome image that does not announce the camera, and full colour when the spotlight is on.

The dual antennas deserve more attention than they get. Imou states Wi-Fi coverage to 100 m, and on an outbuilding or a gable end at the far corner of a plot, signal is the thing that decides whether a camera works at all.

Where it gives ground

Auto-tracking has the same flaw here as everywhere: after following something, the camera is left pointed at wherever that movement ended, which is usually the street. Set a home position over your weakest entry and the feature becomes an advantage rather than a risk.

IP66 is a rating Imou declares, not one measured here. It describes dust and jetting water, which in practice means the camera survives weather and does not survive being mounted where water can sit in the cable gland.

Who it suits

Someone replacing a first camera that cried wolf. The detection is the reason to buy it, the antennas are the reason it keeps working at the end of the garden, and the siren is a bonus rather than a purpose.

Availability

On sale from 34 € to 40 € on the German, French, Italian and Spanish Amazon stores at the time of checking.

Listed but with no offer on the British Amazon store — the reference exists there and nobody is currently selling it.

Not found on the American Amazon store, where the buy link falls back to a local search rather than to a page that does not exist.

Prices and availability are what Keepa reported on the date this page was updated; both move.

Prices quoted in this text were read on 2 September 2026. The live price is at the top of the page.

What we like, and what we don't

Strengths

  • AI person and vehicle detection, stated to cut triggers from insects and moving branches
  • Four night-vision modes, including full colour, per Imou
  • Dual antennas, with Wi-Fi coverage stated to 100 m
  • 110 dB siren and spotlight triggered by human motion

Compromises

  • Auto-tracking leaves the camera pointed wherever the last movement ended
  • IP66 is stated by the manufacturer and is not a test result from here
  • Mains powered — the cable decides the mounting position
  • Cloud retention is a subscription, as with every camera in this class

Specifications

Resolution2K QHD, 3 MP (2304 × 1296), stated by Imou
Coverage355° horizontal, 90° vertical
Night visionFour modes, including full colour, stated to 30 m
DetectionAI person and vehicle recognition, with auto-tracking
Siren110 dB, stated by the manufacturer
Weather ratingIP66, stated by the manufacturer
Wi-FiDual antennas, coverage stated to 100 m
Amazon referenceB08BXZY1D2 (same reference on 5 Amazon marketplaces)
EAN6971927236985

Questions people actually ask

Does AI detection actually reduce false alarms?

Imou states it is designed to filter triggers caused by insects and moving branches, which are the two commonest causes outdoors. It does not remove them: an insect on the lens at night is lit by the camera's own infrared and fills the frame, and no classifier deals with that. Placement out of the weather does more.

What does full-colour night vision need?

Light. Imou lists four night modes, and the colour one relies on the spotlight or on ambient light — a camera cannot make colour out of an infrared image. If you want colour at night, the camera has to be visible at night.

Is 110 dB loud?

It is loud enough to be unpleasant at close range and to wake a house. Decibel figures are quoted at one metre and fall away quickly, so it is a deterrent at the door and much less at the end of a garden.