Quick answer
Choose the 70mai Rear Camera for A810S (RC23/RC24) if you have an A810S or A800SE dash cam and want an affordable, exterior-mounted backup cam. Pick the 4K Rear Camera for T800 (RC41/RC42) if you own the T800 and need a 4K rear view with a wider aperture and higher resolution.
Compatibility is the first filter
The rear camera for A810S works with 70mai Dash Cam 4K A800SE, A810S, and T800. The 4K rear camera for T800 is only compatible with the T800. If you have an A800SE or A810S, the 4K T800 rear cam won't work—your choice is already made.
Both cameras come with two mounting options: an exterior-mounted backup camera and an in-car rear camera. The exact mounting hardware differs between the two models, so check the included brackets before installation.
Resolution and low-light performance differ
The A810S rear camera records at 1080P with an F1.4 aperture, while the T800 4K rear camera records at 3840x2160P (4K) with an F1.7 aperture. The A810S rear cam has a slightly larger aperture (F1.4 vs F1.7), which lets in more light for darker scenes—but at a lower overall resolution.
If you prioritize crisp detail during daytime driving, the 4K rear camera for T800 delivers noticeably sharper playback. If you drive often at night or in dim parking lots, the wider aperture of the A810S rear cam may give you a brighter image, even though it's only 1080P.
Field of view and coverage
The A810S rear camera offers a 140° FOV (exterior) and 130° FOV (in-car). The T800 4K rear camera provides a 146° FOV for both mounting options. The extra 6° on the T800 cam captures slightly more peripheral detail, which can help when merging or reversing.
Both support HDR rear recording for enhanced clarity in mixed lighting conditions, so you won't lose detail in shadows or bright spots.
Trade-offs at a glance
- Resolution vs. low-light performance: The T800 4K rear cam gives you 4K detail; the A810S rear cam gives you a brighter image in darkness due to its F1.4 aperture. Choose based on your primary driving conditions.
- Compatibility limits your choice: If you have an A800SE or A810S, you can only use the A810S rear camera. If you have a T800, you can choose either—but the 4K rear cam is the only one that unlocks 4K rear recording. Check your dash cam model first; compatibility is the deciding factor.
- Field of view trade-off: The T800 4K rear cam offers a wider 146° FOV vs. the A810S rear cam's 140° (exterior) or 130° (in-car). The difference is small but noticeable when merging or reversing.
Product facts at a glance
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70mai Rear Camera for Dash Cam A810S/ T800: Compatible with 70mai Dash Cam 4K A800SE, A810S, and T800. Exterior-mounted backup camera has F1.4 aperture and 140° FOV. In-car rear camera has F1.55 aperture and 130° FOV. Records at 1080P with HDR. If you own an A800SE or A810S, this is your only rear-cam option—and its wider aperture helps in low light despite the 1080P resolution.
70mai Rear Camera for Dash Cam A810S/ T800
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70mai 4K Rear Camera for Dash Cam 4K T800: Only compatible with 70mai Dash Cam 4K T800. Exterior-mounted backup camera records at 4K (3840x2160P) with F1.7 aperture and 146° FOV. In-car rear camera also records at 4K. The 4K resolution provides sharper rear footage for the T800, but the slightly narrower aperture means it may not be as bright in very dark conditions compared to the A810S cam.
70mai 4K Rear Camera for Dash Cam 4K T800
Which rear camera should you choose?
Best for
- A810S or A800SE owners who want an affordable, low-light-friendly rear cam with exterior mounting
- T800 owners who prioritize 4K rear footage and a wider field of view
Not for
- T800 owners who need a brighter rear image in very dark conditions (choose the A810S rear cam instead)
- Anyone without a compatible 70mai dash cam—these are add-ons, not standalone units
