Two different coverage approaches
Omni uses one motorised camera; A139 Pro 3CH uses three cameras aimed at different areas. If front, cabin and rear must be recorded simultaneously, that difference matters more than the 360° label. Our recommendation comes from documentation and an attributed external test, not our own physical testing. Reviewed on 3 November 2026.
Which Omni is being compared
This article covers the original 1080p Omni, not the later 4K Omni. VIOFO means the three-channel A139 Pro, not the non-Pro A139 or one- and two-camera packages. Check these names and included accessories in the listing. Substituting a generation changes specifications as well as installation and cost comparisons.
| Feature | 70mai Dash Cam Omni 360° | VIOFO A139 Pro 3-Channel |
|---|---|---|
| Version | Original 1080p Omni | A139 Pro 3CH |
| Coverage | One rotating camera | Simultaneous front, cabin and rear |
| Video | 1920 × 1080 | 4K front; 1080p cabin and rear |
| Voice commands | English in the checked specification | No; spoken notifications supported |
| Parking | Hardwire kit required | Compatible power and wiring required |
Rotation is not simultaneous all-round recording
70mai describes 340° mechanical rotation combined with a 140° lens, explaining its commercial 360° designation. Our technical interpretation is that the camera can aim at different areas but cannot simultaneously retain events outside its current frame. It cannot remove physical obstructions such as seats or pillars either. Parking needs a hardwire kit, and the checked specification limits voice commands to English.
VIOFO: three views and conflicting documentation
The A139 Pro 3CH specification documents front 4K and two 1080p cameras, GPS and spoken notifications, but no voice-command control. Parking requires suitable power and accessories. Its current table advertises 30 fps, while another official table lists 24 fps across three channels with 2160p front recording. We do not promise an exact combination: confirm the modes supported by the unit and firmware before buying for that figure.
What an Omni tester observed
Tom May at Digital Camera World obtained useful daytime detail but unreadable plates in his nighttime sample. He also found repositioning the adhesive difficult. Those are observations of one unit and specific scenes, not a universal recognition rate or proof of inferiority to A139 Pro. They help assess installation and actual lighting without transferring another outlet’s score to this comparison.
Our choice by requirement
We would favour A139 Pro 3CH for retaining three simultaneous perspectives, accepting additional modules and wiring. Omni makes sense for a single steerable unit if you accept the view it loses when turning. Check clip retrieval and parked power before deciding. We guarantee neither complete coverage nor universal plate readability or accident prevention. Commercial links are searches: confirm model, version and package accessories.