70mai A810 Dash Cam 4K Review: Sony Starvis 2 Powered Driving Security

The 70mai A810 Dash Cam has 30,000+ reviews on JD.com with a 4.5/5 rating at ¥499 ($69). Users praise the exceptional night vision quality from the Sony IMX678 Starvis 2 sensor and easy app setup. Common complaints include the GPS module sometimes failing to acquire signal and the camera overheating in direct summer sunlight. Conclusion: ✅ Worth Buying — best 4K dash cam under ¥500 with class-leading night vision.

Introduction

The 70mai A810 is the successor to the popular A800S, upgrading to the latest Sony IMX678 Starvis 2 sensor — the same sensor used in high-end dash cams costing twice as much. It records at true 3840×2160 4K resolution at 30fps with HDR, delivering exceptional clarity during both day and night driving. 70mai has built a strong reputation in the Chinese dash cam market, competing directly against Viofo and Thinkware.

The A810 includes ADAS (Advanced Driver Assistance System) features, GPS logging, parking mode, and 70mai’s convenient app-based video viewing. With the optional 4G hardwire kit, it can send real-time alerts to your phone when the car is parked.

Specifications

Spec	70mai A810	Viofo A229 Pro	Thinkware U1000	70mai A510
Price	¥499 ($69)	¥1,199 ($166)	¥2,499 ($345)	¥329 ($45)
Sensor	Sony IMX678 Starvis 2	Sony IMX678 Starvis 2	Sony IMX415	Sony IMX675
Front Resolution	4K (3840×2160) @30fps	4K (3840×2160) @30fps	4K (3840×2160) @30fps	2K (2592×1944) @30fps
Rear Camera	Optional (1080p)	Included (2K)	Included (HD)	Optional (1080p)
HDR	Yes	Yes	Yes	No
WiFi	2.4/5GHz	2.4/5GHz	2.4GHz	2.4GHz
GPS	Built-in (GPS mount)	Internal	Internal	External (optional)
Storage	microSD up to 256GB	microSD up to 512GB	microSD up to 128GB	microSD up to 128GB
JD Rating	4.5/5 (30,000+)	4.4/5	4.5/5	4.3/5

Design and Build Quality

The A810 uses a cylindrical form factor with a matte black finish. The main camera unit measures 84×57×37mm — compact enough to fit behind the rearview mirror without blocking the driver’s view. The build quality is solid with tight panel alignment and a satisfying tactile click on the buttons. The included electrostatic sticker mount adheres to the windshield without leaving residue.

The GPS module is integrated into the mount rather than the camera body, which means if you want GPS logging, you must use the GPS mount — and the GPS cable is a different shape than the standard power cable. Some users find this mount design inconvenient. The camera also includes a supercapacitor instead of a lithium battery, which handles high temperatures better and lasts longer.

“The Starvis 2 sensor lives up to the hype. My night driving footage shows license plates clearly at distances up to 15 meters. My previous dashcam (a $50 no-name brand) would show nothing but headlight bloom at night.” — JD.com user

Performance

Daytime video quality is excellent — sharp, well-exposed footage with natural colors. License plates are readable from the lane next to you at both city and highway speeds. The HDR handles high-contrast scenes (tunnel entrances, direct sunlight) well without blowing out highlights or crushing shadows.

Night performance is where the IMX678 really shines. The large 1/1.8” sensor captures significantly more light than the IMX415 found in competitors. License plates are readable from 10-15 meters away under street lighting, and even in near-darkness (unlit roads), you can identify vehicle shapes and movements. The 4K resolution ensures digital zoom remains usable for reading plates.

“Was hit in a parking lot by someone backing out. The A810 captured the entire incident in crystal clear 4K. The other driver tried to deny it, but the footage was undeniable. Paid for itself ten times over.” — JD.com user

User Reviews by Theme

Theme 1: Night Vision Quality

The Sony Starvis 2 sensor’s low-light performance is the most frequently praised aspect.

“Driving home on unlit country roads, the A810 captures detail I can barely see with my own eyes. The 4K resolution means I can zoom in and read plates from dashcam footage at night. It’s genuinely impressive.” — JD.com user

💡 Best-in-class night vision for the price point.

Theme 2: App Experience and WiFi Transfer

The 70mai app allows quick video downloads to your phone, though speeds could be better.

“The 5GHz WiFi transfer is decent — a 1-minute 4K clip downloads in about 30 seconds. The app interface is clean and easy to navigate. Parking mode setup is straightforward via the app.” — JD.com user

💡 App makes reviewing footage convenient.

Theme 3: Heat Management and Reliability

The supercapacitor design is tested in China’s hot summers.

“Parked my car in 40°C+ Chengdu summer sun for a whole day. The dashcam was too hot to touch but still started recording immediately when I turned on the car. No battery swelling issues unlike my old battery-based dashcam.” — JD.com user

💡 Supercapacitor gives excellent heat tolerance.

Theme 4: Common Complaints

The GPS mount cable incompatibility and occasional overheating causing recordings to stop are the main issues.

“The GPS mount uses a different power cable than the standard mount. If your GPS mount breaks, you can’t just swap cables. Had to buy a whole new mount unit. This is a poor design choice.” — JD.com user

“On the hottest summer days (above 45°C in Nanjing), the camera shut down mid-drive. It restarted after the AC cooled the cabin, but this is concerning if you need footage during that time.” — JD.com user

💡 GPS mount design is fragile; extreme heat can cause shutdowns.

Purchase Recommendations

✅ Worth Buying: Anyone wanting reliable 4K dash cam footage with exceptional night vision at a reasonable price. The A810 offers 90% of the performance of ¥1,000+ dash cams.

💰 Premium Pick: For dual-channel recording (front+rear included) and 512GB storage support, the Viofo A229 Pro at ¥1,199 ($166) is the professional choice for dedicated users.

⚠️ Budget Warning: If 4K isn’t essential, the 70mai A510 at ¥329 ($45) offers solid 2K footage with the same app ecosystem and a lower heat profile.

Pros & Cons

✅ Pros	❌ Cons
Excellent Sony IMX678 Starvis 2 night vision	GPS mount cable incompatible with standard mount
True 4K resolution (3840×2160)	Can overheat and shut down in extreme summer heat
Supercapacitor for high heat reliability	Rear camera sold separately (¥179)
5GHz WiFi for faster file transfer	No Bluetooth for easy wireless setup
ADAS features (lane departure, collision)	Parking mode requires hardwire kit (extra ¥89)
HDR for high-contrast scenes	GPS signal acquisition can be slow
Compact size fits behind rearview mirror	No included storage (need to buy microSD)
Good app with easy video viewing	Micro USB power (wish it was USB-C)

FAQ

Q1: Does the A810 include a rear camera? No, the rear camera is sold separately as the 70mai RC06 (¥179, $25). It connects via cable and records at 1080p. The A810 supports the rear camera to create a dual-channel system.

Q2: What size microSD card should I use? 70mai recommends a U3/V30 rated card. A 128GB card stores approximately 8 hours of 4K footage (looped recording overwrites oldest footage). The A810 supports up to 256GB.

Q3: How does parking mode work? With the optional hardwire kit (¥89), the A810 switches to parking mode when the car is off. It uses G-sensor triggered recording — recording starts when the car is bumped or motion is detected. Low-bitrate continuous recording is also available.

Q4: Can I record audio inside the car? Yes, the A810 has a built-in microphone. Audio recording can be enabled or disabled in the app. Note that in some jurisdictions, recording audio without passengers’ consent may have legal restrictions.

Q5: Does the ADAS feature work well? The ADAS (lane departure warning, forward collision warning) works adequately on highways with clear lane markings. On city streets or in heavy rain, false alarms increase significantly. Most users disable ADAS and treat it as a secondary feature.