The motion detection feature activates recording when the mini body camera detects movement. It will automatically stop recording 20 seconds after the motion stops. 

Yes, to enable parking monitoring mode, you need a hardwire kit. This kit is not included and please purchase separately. SKU: GW41.0100. 

Equipped with a DSP chip, the professional metal detector's detection accuracy and anti-interference are much improved. The accuracy is up to 98%. 

So when it powers off, it goes into a sleep mode. That sleep mode doesn't require alot of power, but if you have it set to turn on if the camera detects vibrations, it uses the cars battery. Mine is plugged in all the time and it only powers on when I turn the car on or it feels vibrations. With the vibration setting, it will turn on when I open my car door. But if your power source isn't powered when the car shuts off, then it doesn't use any power, just what the camera has stored up. Hope that helps 

Yes …. You can use anywhere it goes with you… I use mine in our camper