
I have a Viofo a129 Pro Duo dashboard with 512GB Samsung microSD. With the latest software (version 2.2 as of this writing) when you press the button the camera takes 2 pictures, 1 front and 1 back. It also moves current video file to RO folder for saving. The button is pretty useful, I used it about every two days. Pros: 1. It was easy to connect the button to the camera.2. Easy to find and push (well, it depends on where you stick it). I put it in the AC controlled ledge just above my junk yard (front pocket on the center console). It's ten times easier to find than the button on the camera itself, and you don't have to take your eyes off the road (unlike the camera buttons). Cons: 1. Periodic delay of 1-3 seconds after pressing the button. With a video, it doesn't really matter, but with a photo, it can miss the moment.2. The battery cover is very easy to remove. So if you stick the button in an easy-to-reach place, it will fall off quite easily while the cap stays glued. Almost every time I wash my car I have to look for the button afterwards. The battery remains attached to the button. Overall I am very happy with this purchase, despite the torrents.

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