1080P HD Dashcam: Upgraded optical Lens and Wide-Angle accurately captures every detail for you, the road ahead is under total control, either the beautiful scenery or any unexpected incident Built in G-sensor: With built-in G-sensor, the Dash Camera for cars can automatically detect a sudden shake/collision and lock the footage to prevent the video from being overwritten even in loop recording. Accident scene can be truly restored Seamless Loop Recording: Videos that are urgently locked due to collision, vibration,etc. will be retained, while un-locked unimportant videos will be overwritten by subsequent videos after memory card is filled. So video can be recorded for a long time (even weeks) without you having to clear the memory card frequently Automatically Overwriting With Loop RecordingThe dash cam automatically overwrites the oldest videos with the latest ones. The videos can be automatically saved and stored locally on a micro SD memory card while driving,