Action camera is made to be small and very light, so that a person who wear it does not feel its weight while doing his or her things. And it usually uses wide-angle lens to film as many details around as possible. Inside the camera, there is a battery that lasts long enough for you to film for few hours. Action camera is also made to be stronger than normal video camera, so that it keeps filming even when the wearing person moves at high speed or crashes into something.