70mai T800 Review: The Triple-Channel 4K Dashcam I Didn't Know I Needed
Did you ever have one of those moments when you thought your dashcam gear was great, but not really great enough? That's how I felt about the 70mai A800S — an excellent unit, but the back cam just did not measure up to the rest of the product.
Flash forward to today: 70mai used that feedback to create something genuinely remarkable — the T800, their latest flagship model dash cam. And yes, it addresses my biggest issue and corrects a couple of things I didn't realize I needed.
A Quick Throwback
It was about this time last year that I reviewed the 70mai A800S and thought it was an excellent dashcam overall. But the rear 1080p camera was always the Achilles' heel in an otherwise excellent chain. The rear video just wasn't up to par with the front unit, and that gave it an annoyingly unbalanced feel, especially in life-or-death scenarios where rear video matters.
Well, 70mai listened. The T800 replaces that 1080p rear cam with a Sony STARVIS 4K sensor — specifically the IMX678. This sensor not only is clearer, it has better low-light performance, better dynamic range, and actually outclasses the front camera sensor on the A800S. Why? Night and day.
Triple Cameras, Triple Coverage
The T800 is not an update — it's a new class of dashcam. It is the world's first triple-channel 4K front and rear recording and interior camera dashcam.
Yes, it even looks in your car. Perfect if you're an Uber/Lyft driver, parent, or just someone who belts out ballads from time to time while driving.
Interior Cam: Not 4K, But Clever
The interior camera will be 1080p and will come with four built-in infrared LEDs that allow it to record in complete darkness. 70mai won't market it as ghost-hunting gear (they might, though), but the tech is basically the same as the paranormal YouTubers use. Most importantly, it equates to nighttime footage that's as clear as day, whether it's to monitor passengers or kids in the back seat.
The interior cam is adjustable in height as well, and really, 4K would have been overkill here. Everything's right in front of the lens — 1080p works perfectly fine.
Improved Front Cam & Feature Set
The front camera gets the same IMX678 sensor that the back gets, delivering it sharper video, cleaner HDR, and stronger low-light performance. All three cameras are also HDR recording capable now, and the shots speak for themselves — clean license plates, legible road signs, and correct colors, even at night.
What Else Is New?
Buffered Recording: Captures 10 seconds before and 30 seconds after an event is detected.
Collision Detection: Senses collision and auto-records.
Loop Recording: Oldest video overwritten so you never have space problems.
Hardbaked Data: Time, GPS, and speed data baked into your video.
Smart Features & AI: Helpful or Pain in the Neck?
The T800 has Advanced Driving Assistance — lane drift warnings, hazard notices, etc. It's helpful, but the beeping gets a bit annoying. Luckily, it's optional.
It also boasts 24-hour Parking Surveillance and motion detection, but here's the twist: these are additional features that need a hardwire kit (additional cost). I feel that 70mai fell short by not including the basic hardwire kit in the package. It's such an essential inclusion — particularly for city parking — that it ought to be a standard feature.
If you’re interested in remote live viewing, there's a 4G-enabled hardwire kit with a SIM slot, but again, it’s sold separately. Nice option, not essential for everyone.
Setup: DIY or Pro?
Installation is straightforward if you’re using the included USB-C car adapter (yes, the cigarette lighter, if we’re still calling it that). Just plug in, run the cable to the rear camera, and you’re set.
But if you go with the hardwire kit, I would recommend getting it professionally installed unless you know your car's wiring. I had a pro do mine, and it was worth it.
App & Connectivity
The T800 has a decent companion app. You can view and download 40Mbps clips over Wi-Fi 6 (part of the cam), and this is where you'd locate the 4G remote view if you bought that package.
There's a touchscreen, voice control, and buttons as well – perfect for the hands-free emergency recording.
Is It Worth It? Final Verdict
Absolutely. The 70mai T800 is a massive leap forward from the A800S. The triple-camera 4K setup, industry-leading low-light performance, built-in HDR, and AI capabilities make it one of the most feature-rich dashcam offerings on the market.
Yes, it's more expensive, and yes, I wish the hardwire kit was included. But in terms of build, video quality, and features, this is a winner. It even came with a 512GB memory card in my review sample, although I'm not sure if that'll be packaged in all retail units.
Pricing & Availability
The T800 will sell for $279 for the base model, and they have a pre-order discount on right now. I'll post a link below if you want to check it out.
TL;DR
Triple 4K dashcam system (front, rear, interior)
Sony STARVIS IMX678 sensors for front & rear
Interior night vision cam w/ IR LEDs
HDR on all three lenses
Buffered and collision-activated recording
Motion tracking & parking guard (requires hardwire kit)
Optional 4G live monitoring
App support, voice control, touchscreen, and buttons
If you need top-to-bottom, high-def dashcam video with intelligent features built in, the T800's a tough pill to swallow. If you're a ride-sharing driver, a safety-seeking parent, or just someone who simply enjoys tech that gets stuff done — this's a quality step up that delivers.
