WOLFBOX G840S 12" 4K Mirror Dash Cam Backup Camera with 32GB Card and GPS

UPGRADED 4K UHD CLARITY - Experience stunning detail with the front camera's upgrade to 4K UHD (2160p) resolution, paired with a 1080p rear

Connectivity TechnologyUSBVideo Capture Resolution2160pScreen Size12Flash Memory TypecardSupported StandardsTSMemory Slots Available1

About this item

  • UPGRADED 4K UHD CLARITY - Experience stunning detail with the front camera's upgrade to 4K UHD (2160p) resolution, paired with a 1080p rear camera. The extra-large 12" display provides 1.5 times the viewing area of a standard mirror, significantly reducing blind spots for enhanced safety.
  • 5.8GHz WiFi&GPS TRACKING - The included external GPS antenna enables real-time GPS data display directly on the dash cam. Connect to your phone via Wi-Fi and use the "WOLFBOX" app on iOS or Android devices to real-time viewing, playback recordings, and quick sharing of videos.
  • LARGER SCREEN & WIDER VIEW - The WOLFBOX G840S mirror camera features a 170° front lens and a 140° rear lens, offering a broader field of view to minimize blind spots during driving and reversing. The smart split-screen function allows simultaneous monitoring of both lenses, while the 2.5D curved screen seamlessly integrates with your vehicle’s interior.
  • SUPERIOR NIGHT VISION & IMAGE QUALITY - The G840S mirror dash camera is equipped with an upgraded low-reflectivity LCD to reduce daytime reflections. With incorporated WDR & HDR technology for balanced lighting, and a professional-grade sensor paired with a 6-glass lens for superior image quality, nighttime driving or challenging lighting conditions are handled with ease.
Category: Car ElectronicsIn-Mirror VideoRanked #99 of 17 in Car Electronics
8.6Our score
Our verdict

UPGRADED 4K UHD CLARITY - Experience stunning detail with the front camera's upgrade to 4K UHD (2160p) resolution, paired with a 1080p rear

Ranked #99 in Car Electronics · 4 things we like

Quick answer The WOLFBOX G840S 12" 4K Mirror Dash Cam Backup scores 8.6/10 with us. Amazon owners rate it 4.3 out of 5 across 14,878 reviews, in line with the 4.3 average of the 7 in-mirror video we track. It was listed at $139.99 on Amazon when we last checked in September 2026. Key facts: connectivity technology USB, video capture resolution 2160p, screen size 12.

UPGRADED 4K UHD CLARITY - Experience stunning detail with the front camera's upgrade to 4K UHD (2160p) resolution, paired with a 1080p rear camera. The extra-large 12" display provides 1.5 times the viewing area of a standard mirror, significantly reducing blind spots for enhanced safety. 5.8GHz WiFi&GPS TRACKING - The included external GPS antenna enables real-time GPS data display directly on the dash cam.

Connect to your phone via Wi-Fi and use the "WOLFBOX" app on iOS or Android devices to real-time viewing, playback recordings, and quick sharing of videos. LARGER SCREEN & WIDER VIEW - The WOLFBOX G840S mirror camera features a 170° front lens and a 140° rear lens, offering a broader field of view to minimize blind spots during driving and reversing. The smart split-screen function allows simultaneous monitoring of both lenses, while the 2.5D curved screen seamlessly integrates with

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Product information

24 specifications
Compatible with Vehicle TypeBus, Car, Minivan, Truck
Connectivity TechnologyUSB
Other Special Features of the ProductBuilt-In Display, Built-In GPS, Built-In Speaker,Built-In Supercapacitor, Compact Design,G-Sensor,Loop Recording, Intern
Video Capture Resolution2160p
Mounting TypeRearview Mirror Mount
Field Of View170 degrees
Control MethodTouch
Screen Size12
Flash Memory Typecard
Maximum Aperture1.8 f_stop
Auto Part PositionFront Inside
Display TypeLCD
Supported StandardsTS
Memory Slots Available1
Compatible DevicesCar, Bus, Minivan, Truck
Frame Rate30 FPS
Real Angle of View140 degrees
Included Memory Card Size32 GB
Memory Storage Capacity128 GB
Auto Part OrientationFront & Rear
BrandWOLFBOX
Model NameG840S
Built-In Media1080P Backup Camera with screws and 3M tape, 11 feet Car Charger, 32GB Card(in the dash cam card slot), 4K Mirror Dash C
Number of Items1

Pros & cons

What we like
  • UPGRADED 4K UHD CLARITY - Experience stunning detail with the front camera's upgrade to 4K UHD (2160p) resolution, paired with a 1080p rear camera. The extra-large 12" display provides 1.5 times the viewing area of a standard mirror, significantly reducing blind spots for enhanced safety.
  • 5.8GHz WiFi&GPS TRACKING - The included external GPS antenna enables real-time GPS data display directly on the dash cam. Connect to your phone via Wi-Fi and use the "WOLFBOX" app on iOS or Android devices to real-time viewing, playback recordings, and quick sharing of videos.
  • LARGER SCREEN & WIDER VIEW - The WOLFBOX G840S mirror camera features a 170° front lens and a 140° rear lens, offering a broader field of view to minimize blind spots during driving and reversing. The smart split-screen function allows simultaneous monitoring of both lenses, while the 2.5D curved screen seamlessly integrates with your vehicle’s interior.
  • SUPERIOR NIGHT VISION & IMAGE QUALITY - The G840S mirror dash camera is equipped with an upgraded low-reflectivity LCD to reduce daytime reflections. With incorporated WDR & HDR technology for balanced lighting, and a professional-grade sensor paired with a 6-glass lens for superior image quality, nighttime driving or challenging lighting conditions are handled with ease.
What could be better

    WOLFBOX G840S 12" 4K Mirror Dash Cam Backup: questions & answers

    Is the WOLFBOX G840S 12" 4K Mirror Dash Cam Backup worth buying?

    Yes, it is one of the stronger picks in its group. We score the WOLFBOX G840S 12" 4K Mirror Dash Cam Backup 8.6 out of 10. Amazon owners rate it 4.3 out of 5 across 14,878 reviews, in line with the 4.3 average of the 7 in-mirror video we track.

    How much does the WOLFBOX G840S 12" 4K Mirror Dash Cam Backup cost?

    It was listed at $139.99 on Amazon when we last checked in September 2026. That is close to the $139.99 median for in-mirror video in our catalog. Amazon prices change daily, so use the price button on this page to see the current figure.

    What are the key specs of the WOLFBOX G840S 12" 4K Mirror Dash Cam Backup?

    Connectivity Technology: USB; Video Capture Resolution: 2160p; Screen Size: 12; Flash Memory Type: card; Supported Standards: TS; Memory Slots Available: 1. All 24 specifications are in the product information table on this page.

    What are good alternatives to the WOLFBOX G840S 12" 4K Mirror Dash Cam Backup?

    Similar, well-rated in-mirror video in our catalog: WOLFBOX G850 PRO 4K Mirror Dash Cam (8.6/10, 4.3 stars from 1,038 owners); Pelsee S12 Native 4K + 2.5K Mirror Dash Cam (8.6/10, 4.3 stars from 102 owners); WOLFBOX G930 10'' 4K Rear View Mirror Camera (8.6/10, 4.3 stars from 2,455 owners).

    Customer reviews

    All reviews on Amazon
    4.314,878 global ratings
    5 star70%
    4 star10%
    3 star10%
    2 star0%
    1 star10%

    Breakdown from the 10 most helpful reviews we imported.

    S
    Sabre39
    Verified purchaseJune 8, 2025
    A great dash cam with some minor issues

    This is the best dash cams I've owned the quality of the video and ease of use is pretty darn good. ease of installation is really dependent on the type of vehicle you own and the type of installation you want to do. Do you want all the wires neatly tucked away and hidden or do you want to use the sticky cable retention pieces that are in the box and make it easier. And obviously you can always pay a professional to install. I have three things that I would like to see improved on newer models / 2.01. The power button needs to have some kind of isolating rubber around it or be fixed in place.

    P
    PWadzinski
    Verified purchaseNovember 26, 2024
    5 stars... and with a couple of reservations

    First of all, this product is and does exactly what they claim it does. The 12" view display is VERY sharp and clear (with a couple of reservations I will address later), the wide angle lenses show everything and more, the GPS is accurate, and the rear-facing camera works very well, especially if you hook up the wire to the backup light so the unit displays the (adjustable) backup lines. Very useful in parking lots! The variety of settings and adjustments are impressive and useful. All-in-all, a really nice product.Now... here's some things I feel you should know.... First, I'm no expert in da

    J
    Joe Royer
    Verified purchaseSeptember 9, 2026
    Good quality picture

    Amara quality is great. Installation took a little longer than I thought but was not because of the device. Instructions pretty straight forward.I wish it was an option to only use the front or the back camera. For my install, the Wolfbox was just a littlearger than the factory installed mirror of the Buick I put it in. Means the front camera cannot be used. I also wish I could turn off recording. It constantly records.

    Z
    Zuhair Family
    Verified purchaseJune 23, 2026
    Excellent Upgrade for My 2024 Prius XLE

    I couldn't be happier with this dash cam and rearview mirror system. I installed it on my 2024 Prius XLE, and it has made a huge difference in my daily driving. The wide-angle front and rear cameras do an excellent job of eliminating blind spots, and I feel much safer changing lanes, merging, and parking.I had Best Buy install it for $149, and it was well worth the cost. The installation looks clean and professional, and everything works exactly as expected. The large 12-inch mirror display is bright, clear, and easy to see during both the day and night. The rear camera provides a much wider v

    M
    mahnh
    Verified purchaseJune 15, 2026
    Pleasingly surprised by the daytime video clarity

    Updating this review. We hadn’t driven at night but recently drove and the camera is great at night. I attached a picture but the video wouldn’t upload. The mirror provides a nice wide angle view and is better than an actual mirror. I had a couple issues the wire that is provided with the kit was too short. I read that Wolfbox works with you and may provide the correct cable for free. They didn’t give me one but I purchased one on Amazon. The other issue I had was after the second trip the mirror went black. It wound up being the power wire with the fuse that came in the kit was faulty. I used

    A
    A.J.
    Verified purchaseJanuary 14, 2024
    Good Dash Cam

    I've had several different types of dash cams going for about 10 years now. The reasons I upgraded from my last camera are as follows: the sticky mount on the windshield would frequently fall off, I had to remove the camera to put the sunshade, and I wanted something out of the way and less obvious of having a dash cam.Now, I've been using this camera for about 2 months and can give an honest review. It was simple to install and the most time consuming part was wiring the rear camera. It just takes time taking some panels off and routing the wiring along the factory wiring going to the rear; I

    N
    Noah
    Verified purchaseDecember 10, 2020
    Basic features difficult to access/use

    ** Feel free to read my whole review, but I've just taken it down to one star because the system has completely stopped working. Sometimes I can get the screen on, but it doesn't recognize the memory card and won't record even if I can get it powered up, so... **Note: I include power consumption/current draw info at the end of my review.I wrote this review two hours ago as a three star. Then I went and tried to install the rear view camera. Now it's a two star review. I'll explain below.So, I'm six months into owning my dash cam. I like it, but it has recently caused me problems. The install o

    M
    Mmcg
    Verified purchaseSeptember 5, 2026
    Overall good but still some bugs

    The size and clarity are good. I would probably buy the 10” instead of 12” next time. It does what I need which is help me see behind me in my truck when the bed is full. The auto start works most of the time but not all. The SD card has been odd. It has me format repeatedly even after only a 10 minute drive and after 30 or so days of use the mirror said insert SD card even though I never took it out. I removed and reinstalled but still getting the error message so now I have to buy a new card. The loop recording stops on occasion so you have to format the card again to get it to work but it d

    Customer reviews are shown as published on Amazon and are not written by Do Best Deal.