Thank you for considering Sykik cameras for trucks and RVs. This system is designed not only to record what is happening all around your vehicle but also provide a live view to reduce blind spots. Designed for easy installation (about 30 minutes). Starts and stops with your ignition. Recording on a pair of removable Micro SD cards can take up to 20 hours of recording before looping. With built-in "G" sensor, in case of an accident, will keep the corresponding video file of the accident in emergency mode, saves it from loop override.