SJCAM C400
Budget action
~$249

SJCAM

SJCAM C400

A 54 g camera module that drops into a handle carrying a 3000 mAh battery and a big rotating screen — the same split-body idea as the DJI Osmo Nano and Insta360 GO Ultra, executed at half their price. Seven hours and seventeen minutes at 4K30 with the handle attached is the number SJCAM leads with, and nothing else here approaches it. What it does not have is the sensor those two carry: 1/2.3-inch against their 1/1.3-inch and 1/1.28-inch, roughly a quarter of the imaging area, which is the whole difference in low light. Nor is there bare waterproofing. Read this as a very long-running vlogging camera rather than a small flagship.

Approx. price
~$249
No plan sold
Sensor area
28 mm²
1/2.3-inch
Max resolution
4K @ 30fps
Claimed runtime
7 h 17 min
4K30 with the 3000 mAh handle attached; 172 minutes on the 54 g camera alone

Sensor area against the rest of the catalogue

28 mm²

Derived from the standard optical-format table rather than copied off a spec sheet, because makers print a fraction that hides it. The table and the arithmetic.

Battery, with the small print

Maker’s claim
7 h 17 min at 4K30 with the 3000 mAh handle attached; 172 minutes on the 54 g camera alone
Third-party test
None collected. We publish a tested figure only where a named outlet has run one and stated its conditions.

Specifications

Budget action
1/2.3-inch
Not published
4K @ 30fps
Not published
Not published
6-axis gyro EIS
30 m in the case only
1250 mAh
Weight
54 g
Dimensions
68×32×25.5 mm
Screens
Rotating screen on the handle
GoPro folding fingers
GPS
No
Voice control
No
Storage
microSD
Model
C400
Released
2025

Features

  • ●54 g camera module that docks into a handle
  • ●437 minutes at 4K30 with the handle; 172 minutes on the module alone
  • ●Large rotating screen on the handle
  • ●4K30, 2K60 and 1080p120
  • ●Six-axis gyro stabilisation
  • ●Case rated to 30 m
Flip screenGoPro fingersNo plan needed

Strengths

  • +Over seven hours at 4K30 with the handle, the longest figure in this catalogue
  • +54 g module is lighter than a GoPro HERO and close to an Insta360 GO 3S
  • +Rotating screen makes it usable for talking to camera
  • +Half the price of the DJI Osmo Nano and Insta360 GO Ultra it copies
  • +The camera module drops into the handle without a cable, so the changeover takes seconds

Drawbacks

  • −1/2.3-inch sensor — roughly a quarter of the Osmo Nano's imaging area
  • −No bare waterproofing at all
  • −4K30 only, no horizon lock, no log profile
  • −The module has no screen of its own; framing needs the handle

The strengths and drawbacks above are drawn from the manufacturer’s specifications and published reviews. No body of owner reports for this camera has been read, so nothing here claims to speak for its owners.

What owners say

No owner discussion has been collected for the SJCAM C400 yet. The pros and cons above come from the manufacturer’s specifications and published reviews. Rather than fill this space with invented sentiment, it stays empty until there is something real to put in it.

Cameras people look at alongside it

More from SJCAM →
SJCAM SJ30
~$264
Budget action

SJCAM carried the SJ20's two-lens idea forward and gave each lens its own imaging chip and processing path, which is a more serious piece of engineering than the price suggests. The headline is 8K, and the honest reading of it is 8K at 20 fps — below the 24 fps that reads as motion, so it is a stills-adjacent mode rather than a usable video one; 4K60 is the real ceiling. What is unambiguously good is endurance: a 2000 mAh internal cell plus a 4200 mAh power handle gives a claimed seven hours at 4K30, which is longer than anything else here by a wide margin. Horizon lock is the 45-degree kind, which corrects lean but not rotation.

28 mm²
8K @ 20fps5 m bare
Best for: All-day recording where runtime beats resolution
Full spec sheet
SJCAM SJ20 Dual Lens
~$229
Budget action

Two lenses on the front, and neither of them is for 360 capture. One is an f/2.0 daylight lens; the other is an f/1.3 night lens, and the camera switches between them. It is the only camera in this catalogue that solves low light with optics rather than a bigger sensor or noise reduction, and for night riding or filming from a car that is a genuinely different answer. The cost shows up everywhere else: 4K stops at 30 fps, the bitrate is 25 Mbps — the lowest here by a factor of five, and low enough that fast motion visibly falls apart — and there is no horizon lock. It did surprise on endurance, running 2 hours 17 minutes in an independent four-camera drain test, third of four and ahead of a camera costing twice as much.

28 mm²
4K @ 30fps
Best for: Night riding, where a fast lens beats a bigger sensor
Full spec sheet
SJCAM C300
~$159
Budget action

A pocket-shaped body rather than a GoPro-shaped one, and the whole design is organised around recording for hours: a 1000 mAh camera battery that clips into a 2800 mAh grip, for a claimed six hours at 4K30. That makes it a body-cam and vlogging tool more than a sports camera, which is how SJCAM markets it. Dual touch screens, six-axis gyro stabilisation, a 30 m case. The limits are the usual ones at $159 — 4K30 with no horizon lock, no bare waterproofing, and no published bitrate — plus a form factor that does not sit as well on a helmet as a standard action-camera body does.

28 mm²
4K @ 30fps
Best for: Long-form recording clipped to clothing
Full spec sheet