Universal OBD Power Cable for Dash Camera,24 Hours Surveillance/Acc Mode with Switch Button(Micro USB Port)

Instead of shutting off after five minutes, it actually shuts off after about twenty minutes. That's not an issue, just noting the difference. I assume this device is measuring battery voltage to determine when the car is off or running. Charging voltage on a car battery is around 13.5 to 14v (when engine is running). When the car is turned off, the battery is no longer being charged and voltage is just the battery alone @ 12V. I think that's how it works.

Does as advertised. I like how the dashcam stays powered on a few minutes after I shut my car down. Worth the purchase.

For many years, every time I got into or out of my 2009 Chevy Suburban, I had to plug the dash cam power supply into the cigarette lighter or remove it. This is because my cigarette lighter is supplied with electricity even when the engine is off, and the dash cam doesn't turn off when I turn the engine off. This is not optimal, especially if you forget to unplug it and run down the car battery. The REARMASTER Universal OBD Power Cable solves this problem. Whoever invented this should receive the Nobel Prize for Automotive Excellence. After easy installation (just plug it in and route the cord), the dash cam now starts and turns off in concert with the engine. I hear angels singing every time I see that dash cam turn on and off. The only thing I don't care for is that the REARMASTER Universal OBD Power Cable continues to supply power to the dash cam (or other device) for 5 minutes after turning the vehicle off. This unnecessarily drains the battery just a little, and being OCD I prefer to see that the dash cam has turned off before I exit the vehicle. Other than that, it is A+ in every respect. Highly recommended, and Powernoodle Approved.

I purchased the Mini USB OBD Charger with On/Off Switch. This was the only solution I could find to having the device turn on and off with the car, instead of being on 24x7. I am using this for a Garmin GPS, so there's not a need for it to always be on.First, this is not compatible with a Garmin GPS out of the box. It will power the GPS and turn it on, but it goes into PC/Data mode, not map mode. There's a slight work around where you unplug the GPS really quick and plug it back in, but I didnt want to bother with that.I took the USB cable from my current charger, and cut the top off and cut the end of this one off and soldered it into this OBD adapter. After I did this it worked perfect! It turns on when the car turns on, and when I turn the car off, the GPS turns off 5 min later.I just wish It had Garmin GPS support out of the box, and that the auto off time was alot less, like 30 seconds or something.I would totally buy this again to hardwire a GPS in my other car, but PLEASE be aware it's not plug and play with Garmin. If you're cool with cutting 2 USB cords apart, and soldering them back together then by all means go for it :)

I have been using Rear master since 2016. It powered My Yi cam, Apeman Cam. And now my Rove R2-4K. It always turns on when you turn the car on and shuts off 2minutes after parking with the off switch. If you want it on all the time just turn it on.

Simple device with a fairly simple job: send power to my dashcam when the ACC is on. Unfortunately it doesn't do what it says.The device cuts power to the dashcam after five minutes, even when the car is running. You have to use the always-on mode, and then deal with the well-reported issues of running your battery down if you forget to turn it off.Will have to return it :(UPDATE: It turns off in ACC mode after several minutes; how long it lasts before shutting down varies every time.UPDATE 2: Ordered another to see if the first was a dud. The product itself is a dud. Same issue w/ power shutting off after random amounts of time.Used on a 2015 Chevy Malibu. Saw another similar product (looks identical, actually) w/ a note buried deep in the description that said something like 'based on customer feedback this product doesn't appear to work with many GM and Toyota vehicles'. If they know that to be true, that information should be much more accessible.

Currently using this in a 2024 Dodge Durango GT Plus with a Rexing V33 Plus dashboard cam.I know V33 comes with a cable that will allow me to power it directly through the fuse panel, but on the Durango, the fuse panel is under the hood. I did not want to have to worry about going through the firewall to connect it.That is when I found this power adaptor.I love that it can be switched from Always On to ACC Only. I have only had it installed for a day now, and I am leaving it at Always On until I see significant drain on the battery.

2024 UPDATE: Worked fine with an old Aukey dual camera. My 4K VIOFO dual flickers and continually restarts with this unit. Most high end dashcams draw more power than those from 5 years ago.———Original review:My car's accessory plugin does not shut off, so I needed a solution that did not require major surgery to connect my capacitor-powered Aukey dual dashcam to the fusebox. This did the trick, as my OBD port is easily accessed just under the dashboard. I turn it off when parked at home and keep it on when parking in public places to catch any potential hit and run collision or car prowlers.The 2 times I forgot to turn it off and parked for a couple of days, my 8 cylinder car's battery needed a slight boost to start because of the 11.6 volt cutoff, although it was not drained completely. That should be higher, say 12.2, or adjustable, but I can live with it.The company makes similar units with USB connectors that will plug in directly to webcams (or other devices), but I prefer this setup because it gives me more cable length for routing, and I can easily hook up a USB power bank to my camera out of sight for extended parking monitoring.