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On their page, they state it still draws a very minimal current.
See below for the quote:
"Testing has shown that the Range Device has a very small battery draw when the vehicle is off and in "sleep" mode. This is because it needs a monitor running to catch when the vehicle is started. This small draw is not enough to adversely affect battery life or drain the battery unless left in place for an extended period of time (i.e. more than a week or two)."
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