I tried many dash cams from cheap to expensive 2 cam dashcam systems they all failed me from shut downs from heat to firmware issues to sd card constant formats like on the last one i had the thinkware 770 2 cam system $500 system lasted 11 months . i just put in an hd nvr system in my car using a 120volt inverter starting out with dahua 2 hard drive nvr 2 hikvision hd outdoor dome cameras gutted to fit on my winshield dome removed. and a netgear poe switch. so far so good better quality picture too, it depends on quality of the cameras but u can always change them out to your liking. nvr with poe switch and inverter in trunk with inverter remote switch upfront in center dash mounted.