We would not recommend using the Victor M2524 Electronic Mouse Trap outdoors unless it is in a covered area to protect it from the elements. You could potentially make a homemade box to put the trap in that would protect it from the elements like a plastic shoe storage box with the lid on and cutting holes on the sides for access to the entry point of the trap for the mice.
Electronic Mouse Trap - Victor M2524 should be emptied after each kill otherwise it will not be able to kill other mice and for safety reasons.
You may hear a very slight sound when the Electronic Mouse Trap - Victor M2524 catches a mouse, but otherwise the trap is silent and would be safe to use around any animals that are not small enough to fit into it.
Electronic Mouse Trap - Victor M2524 has been discontinued. However, if you do currently have the product, we don't see why you couldn't use it in your car but the rodent would have to go into the trap and then would only be shocked.