The camera uses a simplified 3-to-4 button layout for all operations:
Long-press to power on/off. Short-press to cycle through modes: Video, Photo, Gallery (Playback), and Settings . Head 720p Action Camera User Manual
Press to start/stop video recording or to take a photo. In menus, this acts as the "Select" button. The camera uses a simplified 3-to-4 button layout
Slide the battery cover on the bottom of the camera to open it. Insert the 900mAh battery according to the polarity guides and snap the cover back in place. Head 720p Action Camera User Manual