Review on OBD2 OBD Power Cable for Dash Camera by Ssontong - Mini USB OBDII Adapter Hardwire Charger Cable | 24-Hour Surveillance and Acc Two Mode with Switch Button (Mini USB Port) by Andrew Enriquez

I used them to connect Rexing DVRs in my 2019 GMC Acadia and 2012 Porsche 911. Perfect. I don't use it in the - position, only in the 0 position, so I can't comment on its ability not to drain the battery. However, the 5-minute delay before the DVR shuts down works as advertised. The cable is more than long enough to get from the OBD port to the A-pillar and rearview mirror, with some slack you'll need to hide.