Can someone school me on "scope/shot" cameras ?

[Die Judicii]

I've read bits n pieces about these cameras, but am left scratching my head wondering.
Apparently they are recoil activated.
But,, can supply the user approximately 10 - 15 seconds of film footage prior to the shot being taken.

How can this be ??

Can someone explain how this is possible please,,, to me being (a technologically bankrupt) person.

[on_one_wheel]

Programming, it records all the time but only saves x seconds before and after recoil as a file.

[Blr243]

My pulsar has recoil activated video recording ...I guessed that it was always recording and auto deleting until recoil .. so one wheel has just confirmed my suspicions .... I don’t use it. I should because I always remember to hit recording button before the action but I forget to turn it off after

[northdude]

My sytong can do the same thing but being a tech retard I have no idea how to make it go

[cz515]

Think of it as a slide carosel or one of those view master types popular in the 1990s. Pictures are arranged in a circle and you keep clicking until you reach the first picture again.

Now imagine each picture is a video that you can record. With a bit of technology and software magic it shows you only the video around your shooting