Like they said, pick a hot wire (at least accessory switched!), tap it, add a fuse, then the detector. Ground can go anywhere that's chassis AND metal.
I added an extra cig lighter socket to my car, with a dual usb charging adapter. I put it all under the console and ran the usb charging cables out the front for my phone and out the back for my camera.
I have mine hardwired to a switched port on the driver side fusebox (under dash, not on side), I'll post a photo of which one to use.
no it didn't come with one, but there are directwire cords available to buy online for my whistler cr90, so i basically just have no idea where to begin as far as installing it goes.Did your unit come with a smartcord or other accessory that lets you hardwire it? Or is there one available for it? That's what I used with mine and it simplified everything.