WOLFBOX G840S Mirror Dash Cam Review: Worth It? (October 2026)
In this WOLFBOX G840S review, the G840S is the best fit for drivers who want a large mirror screen, front 4K recording and GPS. Choose another model if you prefer a smaller screen, want voice controls, or need parking monitoring without a separate hardwire kit.
On this page (10 sections)
- What does the WOLFBOX G840S include?
- Is the G840S the right mirror size for your car?
- How should you compare its front and rear cameras?
- Are GPS, Wi-Fi and the included card useful?
- What does parking monitoring require?
- Which WOLFBOX mirror camera fits your priorities?
- How do you set up the G840S?
- What mistakes should you avoid?
- Who should buy the G840S, and who should skip it?
- Final decision: Is the WOLFBOX G840S worth choosing?
The WOLFBOX G840S is a mirror dash cam with front 4K recording, rear 1080p recording and a 12-inch display. This WOLFBOX G840S review finds it suits drivers who want a large streaming rear-view screen and GPS, provided they're comfortable routing a rear camera cable and adding a hardwire kit for parking monitoring.
The G840S comes with a 32GB card, an external GPS antenna and Wi-Fi app access. Its main trade-off is size: that broad display is useful when you want a larger live rear view, but it takes over more of the standard mirror area.
What does the WOLFBOX G840S include?
The G840S combines front and rear recording, a large mirror display, GPS and Wi-Fi. Its 4K front camera and 1080p rear camera record at different resolutions, and the box includes a 32GB card and external GPS antenna.
WOLFBOX G840S Mirror Dash Cam: Best for large-screen drivers
- 12-inch display
- 4K front and 1080p rear cameras
- 32GB card and external GPS antenna
The G840S combines a large mirror display with front 4K and rear 1080p recording. It includes a 32GB card and external GPS antenna.
Pros
- Large 12-inch screen
- Front 4K and rear 1080p cameras
- External GPS antenna and 32GB card included
- Wi-Fi app access and split-screen view
Cons
- Parking monitoring requires a hardwire kit
- Rear camera installation needs cable routing
- The screen may not suit drivers who prefer a standard mirror
The screen can show front and rear views together in split-screen mode. The front lens has a stated 170° field of view and the rear lens 140°, so placement and camera angle still affect how the scene appears in each recording.
The WOLFBOX app for iOS and Android connects over Wi-Fi for live viewing, playback and sharing. GPS data can appear on the dash cam when the external antenna is connected.
WOLFBOX also describes a low-reflectivity LCD, WDR and HDR, and a six-glass lens. These features are intended to help manage screen reflection and varied lighting, but they don't replace careful positioning or good visibility through the windshield.
Is the G840S the right mirror size for your car?
The 12-inch display is the G840S's clearest advantage if you want a large live rear view. It may be a poor fit if you prefer a smaller screen or want to keep using the regular mirror's reflection.
Before choosing it, look at your current mirror and the space around it. Consider where the display will sit, whether it will interfere with a visor or other controls, and whether you can adjust it to a comfortable viewing angle from your normal driving position.
A mirror dash cam changes how you use that mirror area. If you rely on the reflective view when the screen is off, a regular dash cam may be a better fit.
You may also prefer another option if you dislike a screen that fills more of your field of view. Our mirror dash cam vs regular dash cam guide explains the difference.
The G930 is the better WOLFBOX option if you want a smaller 10-inch display. The G840S is the stronger match if you have room for a larger screen and prefer its 12-inch format.
How should you compare its front and rear cameras?
The front camera records at 4K UHD, while the rear camera records at 1080p. Choose the G840S if that front-and-rear split meets your needs; don't assume both views record at the same resolution.
A wider lens covers more of the scene, but it doesn't show every detail equally. Mounting position, angle and objects in the camera's view all affect what a clip captures, so check both views after installation and adjust them before relying on the recordings.
The rear camera can help provide a live view while reversing. Plan where to mount it and how to route its cable before starting the installation, especially if you want the cable tucked away across a long vehicle.
For help weighing resolution, read our 1080p vs 4K dash cam guide. Resolution is only one part of the choice: screen size, rear coverage, how you'll access clips and the installation all matter too.
Are GPS, Wi-Fi and the included card useful?
GPS and Wi-Fi are useful if you want to review or share clips without removing the memory card. The G840S includes an external GPS antenna and a 32GB card to get those features started.
Use the app to connect and check how you want to view, play back or share a clip. For an important recording, keep a separate copy instead of relying on it to remain on the card.
A 32GB card gives you a starting point, but the amount of footage it holds depends on recording settings and how many clips you save. Make a habit of checking card space and transferring important recordings before loop recording replaces older files.
Loop recording allows the camera to make room for new footage by overwriting older clips. It also helps to learn how the camera marks or locks a clip.
Confirm that an important file is protected before continuing your trip. Our loop recording guide covers the basic process.
Wi-Fi access is convenient for short clips, but a larger screen can be more comfortable when you need to review footage in detail. If you plan to copy videos to a computer, follow our guide to watching dash cam footage on a computer.
What does parking monitoring require?
The G840S offers 24-hour parking monitoring with time-lapse recording, but it needs a separate hardwire kit. Factor in that added equipment and installation before buying if recording while parked is a priority.
Time-lapse mode records at a lower frame rate to conserve power and storage. Read the camera and hardwire kit instructions, confirm the setup works for your vehicle, and understand how it powers the camera when the vehicle is off.
Don't assume the included car charger will provide parked recording. Parking monitoring requires a hardwire kit.
If you don't want to install one, choose a camera for driving coverage and skip the G840S for parking monitoring. A battery pack is another option some drivers consider; see our dash cam battery pack guide before deciding how to power parked recording.
Which WOLFBOX mirror camera fits your priorities?
The G840S is the choice for drivers who rank a large screen and front 4K recording above voice controls or a smaller display. The alternatives below make different trade-offs in screen size, alerts and included storage.
WOLFBOX G850 PRO Mirror Dash Cam: Best for alert seekers
- 4K front and 1080p rear cameras
- ADAS and BSD alerts
- 64GB card included
The G850 PRO adds ADAS and BSD alerts, voice control and a 64GB card. Choose it if those features matter more to you than the G840S's larger screen.
Pros
- ADAS and BSD alerts
- Voice control
- 64GB card included
- 5.8GHz Wi-Fi
Cons
- Does not have the G840S's stated 12-inch display
- Alert features may not suit every driver
The G850 PRO records front 4K and rear 1080p video, like the G840S, and adds ADAS and BSD alerts, voice control and a 64GB card. Choose it if those alerts and hands-free controls matter more than having the G840S's stated 12-inch display.
WOLFBOX G930 Mirror Dash Cam: Best for compact mirror areas
- 10-inch display
- 4K front and 1080p rear cameras
- 64GB card included
The G930 pairs a smaller 10-inch display with front 4K and rear 1080p cameras. GPS and a 64GB card are included.
Pros
- 10-inch screen for a smaller mirror area
- Front 4K and rear 1080p cameras
- GPS antenna and 64GB card included
- 5.8GHz Wi-Fi
Cons
- Smaller display than the G840S
- Parking monitor details should be checked for your setup
The G930 has a 10-inch screen with front 4K and rear 1080p cameras. It includes GPS and a 64GB card, so it suits drivers who want a smaller display and more included card storage than the G840S provides.
WOLFBOX G840H Mirror Dash Cam: Best for hands-free controls
- 11.8-inch display
- 2.5K front and 1080p rear cameras
- Voice control and GPS
The G840H pairs an 11.8-inch screen with voice control and GPS. Its front camera records at 2.5K, and you need to supply a memory card.
Pros
- Large 11.8-inch screen
- Voice control and GPS
- Parking monitor support with a separate hardwire kit
Cons
- Front resolution is 2.5K rather than 4K
- Memory card is not included
The G840H has an 11.8-inch screen, a 2.5K front camera, a 1080p rear camera, GPS and voice control. Pick it if hands-free controls matter more than front 4K recording, and remember to provide a memory card.
For wider comparisons beyond WOLFBOX, see our Garmin dash cam models guide and Vantrue model guide.
How do you set up the G840S?
Set up the G840S by choosing the mirror position first, then routing and aiming the rear camera, connecting the GPS antenna and checking the recording before driving. Plan cable paths in advance so you can avoid obstructing your view or interfering with vehicle controls.
Start with the included instructions and check that the mirror screen sits securely over your existing mirror. Adjust the screen from your usual driving position, then make sure you can see the road and use your normal mirror adjustments comfortably.
Next, choose a rear camera position that gives you a clear view and plan a cable route to the front display. Avoid routing cable where it could block your view, catch on moving parts or interfere with airbags; if you're unsure about the route, use a qualified installer.
Connect the GPS antenna as directed, then switch on the camera and confirm that both front and rear views appear as expected. Check the image while parked before relying on the rear view when reversing.
Finally, set up the app and learn how to find, play and protect a clip. If you plan to use parked recording, install the required hardwire kit according to its instructions and confirm the parking mode works before leaving the vehicle unattended.
What mistakes should you avoid?
The most common setup mistakes are choosing a screen without checking fit, leaving the rear camera poorly aimed and assuming a charger alone enables parking monitoring. A few checks before regular use can prevent these problems.
- Don't buy by resolution alone. The front camera is 4K and the rear is 1080p, so make sure that split matches the views you want recorded.
- Don't skip the mirror-fit check. A 12-inch display takes up more space than a smaller mirror camera, and you need a usable position from your seat.
- Don't route the rear cable as an afterthought. Plan its path before mounting the camera, and keep it clear of your view and vehicle controls.
- Don't count on the included card to keep every clip. Learn loop recording and protect or transfer important footage.
- Don't expect parking recording without the right power setup. The G840S requires a hardwire kit for parking monitoring.
- Don't ignore the camera angle after installation. Confirm what each view captures while parked and make small adjustments before driving.
Who should buy the G840S, and who should skip it?
Buy the G840S if you want a 12-inch mirror display, front 4K and rear 1080p recording, GPS and app access. It also makes sense if you want an included card to get started and are prepared to plan a rear-camera cable route.
Skip it if you want a smaller screen, built-in voice control or parking monitoring without adding a hardwire kit. The G930 suits a smaller mirror area, the G850 PRO prioritizes alerts and voice commands, and the G840H offers voice control with 2.5K front recording.
Before you choose, check the screen fit in your car, decide whether you'll install the rear camera and work out whether you need parked recording. For more options, compare the best dash cams for everyday driving or browse mirror dash cams with a backup camera.
Final decision: Is the WOLFBOX G840S worth choosing?
For drivers who want a large display and front 4K recording, the WOLFBOX G840S is the clearest fit in this group. Choose the G930 for a smaller screen, the G850 PRO for its driver alerts and voice control, or the G840H for voice control with 2.5K front recording.
The deciding question in this WOLFBOX G840S review is whether you'll use the large mirror screen enough to accept its size and installation needs. If the answer is yes, and you have a plan for the rear cable and any hardwire kit you need, the G840S fits those priorities well.
Frequently asked questions
Is the WOLFBOX G840S a 4K dash cam?
Yes. The G840S records 4K UHD video from the front camera.
The rear camera records 1080p video, so compare each camera's resolution separately when deciding whether that split meets your needs.
Our 1080p vs 4K dash cam guide explains what those resolution labels mean.
Does the WOLFBOX G840S include a memory card?
Yes. A 32GB card is included, so you can begin recording without buying a card separately.
How much footage it holds depends on recording settings and saved clips.
Check available space and protect important files before they are overwritten.
See our guide to loop recording for how overwriting works.
Can the G840S record while parked?
The G840S has a 24-hour parking monitor with time-lapse recording, and parking monitoring requires a hardwire kit. Check the installation instructions and your vehicle's electrical setup before connecting a kit.
If parked coverage is your main reason for buying, our dash cam battery pack guide explains another power option to consider.
How does the WOLFBOX G840S compare with the G930?
Both models record front 4K and rear 1080p video and include GPS and Wi-Fi. The G840S has a 12-inch screen and a 32GB card, while the G930 has a 10-inch screen and a 64GB card.
Compare the details in our G840S vs G930 guide.
