Some features like tire size change and TPMS are active without being installed.. Other features are “live “ and require it to remain plugged in all times. Got to Tazor websight and you can see a list of both.. I just purchased two weeks back and mine is plugged in all times and thus far I love many of the features.. power folding mirrors with ignition on and off is my favorite one yet.just did a search on it sounds good can you unplug it after the changes are made? and does it leave a foot print in the computer that the dealer could see when in for service