eufy Security Indoor Cam S350 Dual Cameras

The S350 is a dual lens indoor camera: one unit with two lenses, not two cameras. A 4K wide-angle lens takes in the room and a 2K telephoto lens sits beside it, and the two work together to give 3× genuine optical zoom, so when you zoom in on a face across a room you get real detail rather than a bigger, blurrier crop. Push further and it reaches 8× hybrid zoom. It can also show both lenses at once in Dual View.

• How a dual lens indoor camera zooms
• It follows what it finds
• The best radio eufy puts indoors
• Two limits worth knowing before you buy
• Where the S350 fits

The head pans a full 360° and tilts 75°, and AI Tracking follows what it finds. On-device AI separates people, pets and a crying baby from ordinary movement and sound, so notifications mean something.

It is the best-connected indoor camera eufy makes: dual-band Wi-Fi 6 on 2.4 and 5 GHz with WPA3, rather than the 2.4 GHz-only radio on the cheaper models. Recordings go to a microSD card up to 128 GB, to a HomeBase 3, or over RTSP to a NAS, with no subscription in any case.

Two things to know before you buy. Night footage is infrared black and white; there is no spotlight and no colour night vision. And 4K applies to single-lens view: switch on AI Tracking or Dual View and recording caps at 2K.

How a dual lens indoor camera zooms

A dual lens indoor camera is not two cameras in a row. A 4K wide-angle takes in the room and a 2K telephoto sits beside it, and the pair work together for 3x genuine optical zoom, so zooming on a face across a room gives real detail rather than a bigger, blurrier crop. Push further and it reaches 8x hybrid. Dual View shows both feeds at once.

The lenses are 2.8 mm and 8 mm, both f/1.6, covering 130 and 46 degrees diagonally.

It follows what it finds

The head pans a full 360 degrees and tilts 75, and AI Tracking turns it to keep whatever it spotted in frame. On-device AI separates people, pets and a crying baby from ordinary movement and sound, so a notification means something happened rather than something moved.

The best radio eufy puts indoors

Dual-band Wi-Fi 6 on 2.4 and 5 GHz with WPA3, rather than the 2.4 GHz-only radio on the cheaper models. On a house with a busy network that is the difference between a smooth live view and a stuttering one.

Recordings go to a microSD card up to 128 GB, to a HomeBase 3, or over RTSP to a NAS. There is no storage built into the camera itself, and no subscription in any case.

Two limits worth knowing before you buy

Night footage is infrared black and white. There is no spotlight and no colour night vision on this model, so if you want colour after dark, look at the outdoor cameras with a light built in.

And 4K applies to the single-lens view. Switch on AI Tracking or Dual View and recording caps at 2K. That is a fair trade for most rooms, but it is not what the headline number implies.

Where the S350 fits

This is the top of the indoor range: the one to buy if you want optical zoom and a 5 GHz radio. The C220 and the Pan and Tilt cover the same room for less if you do not. eufy list this as the T8416 at eufy.com.