digitsea L9000 HD 1080P Car Camera Vehicle DVR Accident Video Recorder Dashcam Road Dash Cam Video Recorder Rearview Mirrors Monitor Mount Dual-Camera /140 Degree Wide Angle View / G-Sensor Slim with Microphone 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. 3 in 1 function, Rearview mirror + front camera DVR + rear view camera.Please Note:300mah battery that lasts 30 minutes. This unit is intended for your car in which it will always be plugged into the car charger.