70mai Dash Cam 4K Omni Review

Introduction

The 70mai Dash Cam 4K Omni is a 4K camera with a difference. While most of the time it faces forwards, it’s built on a motorised turret that lets it turn through almost 360 degrees, capturing more of the road or your vehicle’s interior. You can optionally buy it paired with a conventional rear-window camera – that’s the bundle I’m testing here.

I’ll come on to the rotating mount, but first let’s look at the main specifications. The front camera shoots 3,840×2,160 resolution video at up to 60 frames per second (fps), although it’ll only do 30fps if you have a rear camera connected. The rear manages 1,920×1,080 footage at 30fps. The front camera looks after storage for both, with a MicroSD slot that supports up to 512GB cards.

Design and features

• Robo-minion design
• Easy to fit
• High video specifications

This is an unusual dash cam, looking a little like an inverted robot clinging to your windscreen. Most of its bullet-shaped body stays still. It’s on this static part that you’ll find a 3.6cm colour screen, along with a MicroSD card slot and some basic controls for the menu system. Only the bottom third or so of the device can rotate – that’s where you’ll find the camera lens.

The 70mai Dash Cam 4K Omni fixes to your windscreen via a slimline circular mount. It’s great that 70mai includes a couple of electrostatic stickers for this, along with an extra sticky pad, so it’s easy to position and reposition, or even to swap it into a new vehicle.

You can twist the camera quickly on and off its mount, although both the power and rear camera cables plug directly into the camera body, which creates a bit more hassle if you’re in the habit of removing the dash cam when you park.

Once you’ve fixed it to the windscreen, this camera lets you adjust it for pitch (up/down), but not for roll (banking left or right). The motorised turret alters the yaw (turning left or right) once you’ve got it set up.

Things are a bit more simple with the rear camera, which is a small cylindrical device that sticks onto the rear window.

Again, this comes with a couple of electrostatic stickers and a spare sticky pad, so it’s quite easy to get into place. The camera body itself twists, letting you fine-tune its vertical aim, but not any other axis. You can use either the app, or the screen’s live view to get both cameras aimed in the right directions.

While the front camera feels well made, I wasn’t too impressed by the rear’s cheap-feeling plastic. While I’m at it, I didn’t love the supplied cigarette power adaptor either; its dual USB-A slots were quite resistant to having cables inserted.

You can buy a hardwiring kit for this camera, and US consumers can also buy it with an LTE (cellular) modem kit. The former provides constant power, letting you use the 70mai Dash Cam 4K Omni’s parking protection features. These offer the usual reassurance of detecting an impact, but this camera can also perform the neat trick of motion-tracking people as they walk around your car. If you’re in a supported territory, the LTE kit adds instant alerts, and remote viewing and tracking.

Once you’ve physically fitted the 70mai Dash Cam 4K Omni, you’ll need to install the 70mai app to configure all of its features. This is straightforward enough, and the initial setup lets you select the angle it’ll default to when you turn it on – letting you capture the full front view if you’ve had to mount the camera off-centre.

The app offers the usual clip library, letting you browse, view and download footage to your phone, although it doesn’t have an intuitive timeline view as you might find in the best apps. Alternatively you can just pop out the MicroSD card and browse it on a computer.

The final setup step is to configure the advanced driver-assistance system (ADAS), which you’ll need to do while stationary, before taking a short drive to let the system calibrate itself. This dash camera offers forward collision warnings, pedestrian and cyclist collision warnings, vehicle-in-front alerts, and a lane-departure warning, but you can deactivate any or all of them.

The 70mai Dash Cam 4K Omni is only the second camera I’ve reviewed to use the Sony STARVIS 2 IMX678 sensor, which is a high-end chip specifically designed for surveillance and dash cam use. While the superb Viofo A329 is capable of 60fps recording even with a rear camera connected, here you’ll be limited to 30fps if you also have a rear camera.

Even so, this dash cam eats up storage space very quickly. Every minute the rear camera saves a 78MB file, while the front produces variable file sizes from around 230-390MB depending on conditions. I measured an average of about 250MB from the front, giving a total of roughly 325MB for every minute of recording. At that rate, you’ll fill up a 64MB memory card in a little over three hours of driving. Unless you only make short trips, I’d recommend a bigger card.

One final noteworthy feature is this camera’s ‘personality’, along with its voice control features. I’m normally scornful of devices that introduce themselves, but there’s something reasonably endearing about the 70mai Dash Cam 4K Omni’s ‘Maix’ identity, combining occasional prompts and warnings with a face displayed on the screen.

You can use a range of voice controls while driving to tell Maix to capture to the left or right of your vehicle. You can also instruct them to point at the cabin, although without any infrared light source this isn’t particularly useful at night.

It’s easy to understand the need for these unobtrusive features, but I’m less convinced by the fact you can also take a selfie, or shoot a vlog. In the latter, the camera pans fully around its range before prompting you to pose, which seems like an unnecessary distraction from driving.

Performance and video quality

• Excellent video quality
• Reliable AI and voice detection

I tested the 70mai Dash Cam 4K Omni in March 2025, when I could subject it to bright spring skies, dark nights, and the occasional deluge. The most important thing I discovered is that it’s a very capable dash cam, capturing excellent, crisp footage in almost any lighting conditions.

By day, individual frames were sharp enough that I could read almost every number plate in videos shot around town: it’s harder on faster roads where there’s a quicker closing speed, but this dash cam still performed well.

The camera coped well with low sun, capturing details on the shaded side of cars passing under blazing sunlight.

It was also especially impressive at night where, like the Viofo A329, it exposed far more detail of dimly-lit pavements than other cameras I’ve tested.

It was unusually good at capturing number plates on my night time tour around a city block. This poses a particular challenge for dash cams given that plates are designed to reflect your own headlights, creating a spot that’s much brighter than its surroundings. On this camera, they didn’t ‘blow out’ to white – I was impressed by how many registrations were legible despite a full hit from my lights.

Rear-facing cameras are always inferior to the main dash camera unit, a problem that’s compounded at night by the fact it’s usually darker behind your car than in front of it. The optional camera bundled with the 70mai Dash Cam 4k Omni isn’t the best I’ve tested. By day, its footage is generally good enough to capture anything going on behind you, but I found that only the centre of the frame was crisp. Off-centre features, and especially those nearest the camera, tended to blur significantly, even at relatively low speeds.

By night the rear camera exposed some detail under streetlights, but it didn’t seem as capable of capturing number plates as some other rear-facing cameras I’ve tested – even with help from my car’s bright brake lights.

With many modern cars now having onboard driver assistance features, not all owners will want help from their dash cam. The lane change, pedestrian and other warnings built into my car all work brilliantly, and have the advantage that they’re linked to systems that can help me brake or steer my way out of trouble.

That said, drivers of older vehicles might find warnings helpful, and the systems built into the 70mai Dash Cam 4K Omni seem to work particularly well. It spotted whenever I changed lanes on a motorway, warned me when the car in front set off from stationary, and tended to warn fairly reliably when I was sharing road space with pedestrians or cyclists. This camera also warns when you’re rapidly closing up on the car ahead.

I was also impressed with Maix’s voice control. This reacted quite reliably to anyone in my family giving instructions to take selfies or shoot vlogs – something I came to rue when driving three young children home from a party. Perhaps more impressively, in all my testing the camera only mistakenly activated once.

I wasn’t won over by the front camera’s rotating party tricks. Even in decent light and at slow speeds, nearby objects tended to blur as they streaked past the left window.

Greater separation from the camera meant there was less relative movement, and less blurring in footage shot to the right. However, the wide-angle lens means there’s plenty of your cabin in the shot, and the camera struggled to expose both at once.

With no infrared light to help illuminate the cabin, selfies and vlog footage also became pretty dark into the evening – the exposure is helped in this image by my headlights, reflected off the front of my house.

This camera certainly wouldn’t be a suitable solution for cab drivers looking for a way to film incidents inside their vehicle at night, and there’s no cabin camera add-on available.

Should you buy it?