Windshield mounted detectors are still mostly designed to plug into your 12V "cigarette" port. Some come with a straight cord so you can wire it into your vehicle's 12V system. Basic knowledge of automotive 12V power helps, like location of your fuse panel.
A silent startup sequence option would have been nice!
Edit: I just remembered... YEARS ago with the V1g1, I built this crazy rig that automuted the startup. Once 12V was applied to the detector, a timed relay would tap the mute button via the 4-conductor cable. No I don't remember the pinout...
You had me at "Radar Detector Wars: The DS1 Strikes Back"
The BSM Menace
Attack of the LIDAR
Revenge of the LNA
A New Detector
Return of the Rocky Mountain Radar
The Firmware Update Awakens
The Last J-Out
The Rise of the Batman Detector
As you can see, I've actually put a label on mine: "Good for data/FW" so it doesn't get lost in the junk drawer.
Edit: If you're using a Mac, be aware that the Mac version is especially fussy. I just use a Windows machine.
If you're using a "junk drawer" USB cable, you may be out of luck.
We have discovered that if you find a good one, label that cable and set it aside for firmware updates. Don't lose it!
For some reason, the R7 (and other detectors) are really choosy about the quality of cable you use.
My own two cents: If you buy a packet or packets, be aware that the stuff has a definite shelf life, like bread.
I've bought packets to save for later, only to have them go bad (hard) later on, all by itself, in the package.