Wolfbox

Wolfbox G840S

Name: Wolfbox G840S
Brand: Wolfbox
Price: 170 USD
Availability: InStock

No rating shown: we have no owner rating for this camera from a source we can cite. Why

4K frontSupercapacitor

A mirror cam replaces the rearview mirror with a 12-inch touchscreen and puts the rear camera on the tailgate, so the screen shows a live rear view with no headrests, passengers or cargo in the way. For a packed SUV, a van with no rear glass, or anyone towing, that is a genuinely different product rather than a styling choice. The G840S records 3840x2160 from the front on a 170-degree lens and 1080p from the rear at 150 degrees, both with HDR, onto cards up to 512GB. Power is a supercapacitor rated -4 to 158 degrees Fahrenheit. The specification to think hardest about is that front lens: 170 degrees is the widest in this catalog, and spreading 3840 pixels across it gives about 23 horizontal pixels per degree, so despite the 4K label it resolves less detail per degree than several 1440p cameras with narrow lenses. A mirror cam is bought for the view, not for the plate.

Approx. price: ~$170
Hot car: Supercapacitor; Supercapacitor, rated to 158°F
Parking tier: Time-lapse / motion; Hardwire kit optional

Best for

A loaded SUV, a van, or a tow vehicle where the normal mirror shows nothing useful.

The description and the pros and cons above are written from published specifications, not from owner reports. Owner sentiment, where we have it, is in its own section below.

What the numbers mean here

The front camera records 3,840 horizontal pixels across a published 170-degree field of view, which is 22.6 pixels per degree — plate-legible a few lengths ahead. The rear channel manages 12.8, so it is the less detailed of the two. How this is calculated, and what it does not tell you.

It runs on a supercapacitor rather than a lithium cell, so there is no battery to swell in a car parked in summer sun — the classic way a windshield-mounted camera dies. The maker publishes an operating range of -4°F to 158°F. Supercapacitors and heat.

Records continuously at a reduced frame rate, or only once motion or an impact is detected. You get context, at one to three frames a second. The hardwire kit is a separate purchase, which is the line item people forget when budgeting. What each parking mode records.

Specifications

Manufacturer-published figures, recorded from Wolfbox’s own product page and a specialist retailer’s spec table. Fields the maker does not publish are omitted rather than guessed.

Type: Mirror cam
Channels: 2
Front resolution: 2160p
Front frame rate: 30fps
Front field of view: 170° (as published)
Rear resolution: 1080p
Rear field of view: 150°
HDR: HDR
Power cell: Supercapacitor
Operating temperature: -4°F to 158°F
Parking modes: time-lapse, motion
Hardwire kit: optional
GPS: built-in
Wi-Fi: 2.4 GHz
LTE / cloud: None
Max storage: 512GB microSD
CPL filter: optional
Screen: 12-inch touchscreen
Voice control: No
Form factor: mirror
Mount: clip
Release year: 2022

Features

12-inch touchscreen replacing the rearview mirror
Front 4K at 170 degrees, rear 1080p at 150 degrees, both with HDR
Live rear view unobstructed by passengers or cargo
Supercapacitor rated -4 to 158 degrees Fahrenheit
Built-in GPS, microSD to 512GB
Adjustable parking guidelines on the screen

Where it is strong

The live rear view solves a real problem that no windshield camera addresses - a blocked mirror
A 158F ceiling, which is higher than Garmin, Thinkware or Vantrue publish for anything
512GB card support and 4K front recording for under two hundred dollars
The screen doubles as a reversing camera with adjustable guidelines

Where it gives way

The 170-degree front lens drops pixel density to about 23 per degree despite the 4K label
A 12-inch lit screen across the top of the windshield is a lot of glare at night, and some drivers never get used to it
2.4GHz Wi-Fi only and no voice control
Wolfbox does not publish sensor part numbers or apertures

What owners say

Summarised from public owner discussion. Nothing here is our own testing.

The G840S is the cheap way into a mirror cam and owners coming from a more expensive one years ago describe it as the same capability for half the money. The backup-camera function gets specific praise from city drivers who parallel park constantly, and the factory-mirror look matters to owners who do not want a visible screen advertising a car worth breaking into.

Complaints here go to the heart of what a mirror cam is for. The rear feed on the display looks lower quality than the 1080p specification suggests, and glare on the mirror surface washes it out badly enough that owners describe the image as almost completely gone in some light. If the live rear view is why you are buying a mirror cam, test it in bright conditions before you commit.

The install fault to know about is a hardwired unit that will not power down when the ignition does - reported by an owner who returned the first unit and had the same behaviour from the replacement, which points at the wiring or the kit rather than a bad camera.

What owners like

Owners coming from an older mirror cam describe it as the same capability for half what they paid years ago
The backup-camera function is genuinely useful for parallel parking in a city, which owners in New York single out
It looks close enough to a factory mirror that owners worried about attracting a break-in choose it over a visible head unit
The rear camera can be mounted inside or outside the vehicle, which gives options on vans and hatchbacks

Common complaints

Hardwired units that will not turn off with the ignition have been reported, and a replacement unit did the same thing for the same owner
The rear feed on the mirror display looks lower quality than 1080p to owners, which undercuts the whole point of a mirror cam
Glare on the mirror surface washes the image out, which owners describe as almost completely destroying it in some light
Two-channel playback in Wolfbox's own desktop player shows a blank second screen for some owners
Running the rear cable to an external mount is awkward on cars without an obvious route, and the manual and the website disagree about whether inside mounting is supported

What owners of the Wolfbox G840S ask

Why won't it turn off when I take the key out?

An owner reported this on two consecutive units, which suggests the install rather than the camera. Check that the accessory lead is on a fuse that actually dies with the ignition - use a test light rather than a wiring diagram, because accessory circuits in modern cars often stay live for several minutes or until a door opens.

Is the rear view good enough to replace a mirror?

Owners are mixed. The image looks lower quality on the display than the 1080p specification implies, and glare on the mirror surface washes it out in bright conditions. It is genuinely better than a mirror blocked by headrests and cargo; it is not as good as a clean mirror on an empty car.

Should the rear camera go inside or outside?

The manual recommends outside and the website says inside is acceptable, which is not helpful. Outside gives a cleaner image with no glass or tint in the way and a better reversing view; inside is a far easier cable run. On a car with no obvious route through the tailgate, inside is the pragmatic answer.

Does the desktop player work?

Owners report the Wolfbox player handling single-channel playback fine but showing a blank second screen in two-channel mode. Playing the front and rear files separately in an ordinary video player works. It is a software limitation rather than a recording fault - the files themselves are fine.