digitsea H3000 Rotatable Dual Lens 120 Wide Angle 8 Car DVR Vehicle Camera Video Recorder camcorder Carcam Road Dash Cam Parking Video Registrator 1.On Start Up Recording: this dash cam will start and record automatically when start your vehicle, and will turn off about 1minute (configured by auto power off function) later after you turn off the engine. 2.Loop Recording: When the storage space is full, it can automatically cover the earlier segment. 3. G-sensor automatic trigger for file protection: When an impact, emergency brake occurred or the car tilted, it will protect the previous, present and next video files automatically. Through this function the important files won't be removed by loop recording. 4. Continuous real time video without even one second of missed video, which makes your evidence being more reliable. 5.Supports high capacity TF card, up to 32GB TF card(Storage card is not included).Ensure the memory card is a genuine high-speed card CLASS6 or more, low-speed card does not support record at 1080P.