The VIOFO A129 series are dual-channel dashcam series including A129 Duo, A129 Duo IR, and A129 Pro Duo.
If you’re only using the front camera then it can record at 60 fps. But both front and rear (or interior) cameras simultaneously record at 30 fps.
The front camera could either connect with the rear camera or interior camera to realize dual-channel recording. The front camera could not connect the rear camera and interior camera together to realize three-channel recording.