True 4K Front + 1080P RearSony STARVIS 2 Night Vision5GHz WiFi + GPSFree 64GB Card Included
When a reckless driver cuts you off, backs into you in a parking lot, or lies to the police Officer, it’s your word against theirs—unless you have 4K video proof. The Cosari RoadGuard 4K Duo records simultaneous 4K UHD front and 1080P rear footage with Sony STARVIS 2 HDR night vision, built-in GPS speed logging, and instant 5GHz smartphone download.
$129.99 $259.99 SAVE 50% $109.99 each when you buy 2
Cheap dash cams turn reflective license plates into a blown-out white rectangle at night. RoadGuard 4K Duo combines a 8-megapixel 4K sensor with multi-exposure HDR and a 7-layer f/1.5 glass lens to freeze readable license plates at 65 mph day or night.
Never fumble with tiny SD cards on the shoulder of the highway. Connect to RoadGuard’s 5GHz WiFi in the free Cosari Drive App (zero subscription fees) to replay and download 4K clips with embedded GPS speed, coordinates, and Google Maps route right at the scene.
Lithium-battery dash cams swell and fail on hot July windshields. RoadGuard 4K Duo uses an automotive-grade supercapacitor rated up to 158°F, a 3-axis G-sensor that locks impact footage automatically, and 24-hour hit-and-run parking surveillance.
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Your 24/7 Eyewitness Against Insurance Fraud, Rear-Ends & Hit-and-Runs
$129.99$259.99SAVE 50%
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✓ One Saved Deductible Pays for It 10× Over: the average disputed car accident raises your insurance premium by $1,400 over three years—plus a $500 to $1,000 collision deductible. Cosari RoadGuard 4K Duo gives you indisputable 4K front and 1080P rear video evidence.
✓ Discreet Behind-the-Mirror Design: tucks neatly behind your rearview mirror so it never blocks your line of sight, and attaches via removable electrostatic windshield film that leaves zero sticky residue.
✓ Seamless Loop Recording + G-Sensor Lock: automatically overwrites the oldest uneventful clips on the included 64GB card while permanently locking any video where the G-sensor detects sudden braking or impact.
✓ 10-Minute DIY Install: includes a 20-foot rear camera cable and a plastic trim-tucking tool to hide the wire cleanly along your headliner and weatherstripping.
Cosari RoadGuard 4K front dash cam, 1080P rear window camera with 20-ft cable, FREE 64GB U3 microSD card, dual-USB car power adapter (11.5-ft cable), 2× electrostatic windshield films, extra 3M VHB pads, wire trim pry tool, cable clips, user guide.
Free US shipping. Orders ship within 1–2 business days with full tracking. Return within 30 days of delivery for a full refund under our 100% money-back guarantee. Faulty, damaged or wrong item: we email a prepaid return label and you choose a refund or replacement. See our refund policy.
Not all dash cams are equal. Cosari RoadGuard 4K Duo leads on 4K STARVIS 2 plate clarity, 5GHz WiFi speed, and included storage — and is certified Best Choice of 2026.
| Feature | Cosari RoadGuard 4K Duo★★★★★ | Others★★☆☆☆ |
|---|---|---|
| Front + Rear Resolution | True 4K Front + 1080P Rear | 1080P Front Only |
| Night Vision Sensor | Sony STARVIS 2 HDR (f/1.5) | Basic Sensor (Plate Glare) |
| High-Heat Power Supply | 158°F Supercapacitor | Swelling Lithium Battery |
| 5GHz WiFi + Built-In GPS | ✓ | ✕ |
| Hands-Free Voice Control | ✓ | ✕ |
| Free 64GB U3 Card Included | ✓ | ✕ |
| Award Winner 2026 | ✓ | ✕ |
Captures both the driver who brake-checks you in front and the tailgater who rear-ends you behind.
Multi-exposure HDR prevents headlights from washing out license plate letters at night.
Download 4K video with stamped MPH speed and GPS coordinates to your phone in 5 seconds.
Engineered for baking Arizona, Texas, and Florida windshields without battery swelling.
Say 'Lock Video' or 'Take Photo' to save a clip without taking your hands off the wheel.
Ready to record out of the box—no extra $25 memory card purchase required.
Apply the residue-free static film and press the front camera behind your mirror and rear cam on your back glass.
Use the included pry tool to tuck the wire along the headliner edge in 10 minutes—starts automatically with your ignition.
Open the free Cosari Drive app over 5GHz WiFi to view, trim, and share 4K footage with one tap.
Yes! Everything is in the box: the 4K front dash cam, the 1080P rear window camera with 20-ft connection cable, AND a free 64GB U3 high-endurance microSD card.
Not at all—95% of our customers install it themselves in 10 to 15 minutes with no tools. You simply use the included plastic trim tool to push the thin wire under the soft rubber door weatherstripping along the roof edge.
Zero. The Cosari Drive iOS/Android app, 5GHz WiFi transfers, and GPS speed/map logging are 100% free forever.
Loop Recording automatically overwrites the oldest uneventful files so you never have to erase the card manually. Any clip triggered by the G-sensor (or voice-locked by you) is stored in a protected folder that cannot be overwritten.
Yes. Because it uses an automotive supercapacitor instead of a lithium-ion battery, it operates safely up to 158°F (70°C) without swelling or shutting down.
When parked, the built-in G-sensor wakes the camera within 1 second if someone bumps your bumper in a parking lot (or records continuous 1fps time-lapse when paired with a fuse-box hardwire kit).
Our 2-Car ($109.99 each) and 3-Car ($94.99 each) bundles are our most popular options—and every unit is backed by our 30-day 100% money-back guarantee.
Marcus & Julie T.
★★★★★Saved me a $1,000 deductible and a at-fault ticket on I-95!
A guy in a BMW merged straight into my front fender without signaling and told the state trooper I swerved into his lane! I pulled up the 4K clip on my iPhone over WiFi right on the shoulder. The trooper watched it for 10 seconds, handed me back my license, and cited the other driver 100% at fault.
Owned 6 weeks · Florida · verified buyer
Brian L.
★★★★★Actually reads license plates at night without headlight wash-out
STARVIS 2 HDR is a huge leap over my old 1080p cam. Plates are crisp even in rain.
Owned 3 weeks · Washington
Stephanie R.
★★★★★Rear camera caught a hit-and-run in the Costco parking lot
Came out with my groceries to a $2,200 dent in my rear tailgate. Checked the rear 1080p camera and had the truck’s face AND rear license plate clear as day as he backed into me and drove off. Police tracked him down that afternoon!
Owned 5 weeks · California
Dave & Sons K.
★★★★★Ordered the 3-pack for my truck, my wife’s SUV & our 17-year-old’s Civic
At $94.99 each for three complete front+rear 4K kits (with the 64GB SD cards included!), you can’t beat the peace of mind. Installed all three in one Saturday morning.
Owned 1 month · Texas · bought 3
greg H.
★★★★★Survives 116°F Phoenix parking lots with the supercapacitor
My last two battery dash cams melted and puffed up in July. This supercapacitor Cosari runs flawlessly.
Owned 6 weeks · Arizona
Kevin M.
★★★★★5GHz WiFi transfers a 1-minute 4K video in 6 seconds
Old 2.4GHz dash cams took 4 minutes to download a single clip. 5GHz WiFi on the RoadGuard is instant.
Owned 4 weeks · Ohio
Pauline W.
★★★★★Voice command 'Lock Video' is so smart
Saw a deer jump across the highway ahead of us, said 'Lock Video' out loud, and it beeped and saved the clip without me taking my hands off the wheel.
Owned 5 weeks · Pennsylvania
Nolan B.
★★★★★Static windshield sticker makes moving between cars easy
Stick the clear static film on the glass first, then stick the 3M mount to the film—peels off cleanly whenever you want.
Owned 3 weeks · Illinois
trent G.
★★★★★20-foot rear cable easily reached the back window of my F-150 Crew Cab
Even had 2 feet of slack to spare on a full-size pickup.
Owned 4 weeks · Georgia
carmen D.
★★★★★Love that the 64GB U3 SD card is already in the box
Most brands make you buy a separate $25 high-speed card. Plugged it in and it started recording immediately.
Owned 3 weeks · North Carolina
Victor S.
★★★★★Dual-USB car plug still gives you a fast-charge port for your phone
Thoughtful touch that the 12V adapter has an extra USB port on the back.
Owned 1 month · Virginia
Uber Driver Sam K.
★★★★★45,000 miles a year in Chicago traffic—never drive without it
Rock-solid reliability every single day.
Owned 7 weeks · Illinois
heather P.
★★★★★GPS speed stamp got my speeding ticket dismissed!
Video proved I was doing 54 mph in a 55 zone, not the car that passed me in the left lane.
Owned 5 weeks · New Jersey
Owen C.
★★★★★Hides completely behind my rearview mirror
I can’t even see it from the driver’s seat unless I lean over.
Owned 3 weeks · Colorado
Linda F.
★★★★★Fast 2-day shipping, took me 12 minutes to install
Included orange trim tool tucked the wire out of sight effortlessly.
Owned 2 weeks · Michigan
arthur V.
★★★★★Matches my buddy’s $329 Viofo A229 Pro for less than half the price
Same STARVIS 2 night clarity, way better price.
Owned 2 months · New York