my 07 charger has a the remote key...priced an extra key on ebay for 100.00...i can get a regular sentry key for 15.00 without the remote head..i read in the manual that the regular sentry key will turn off the alarm once the car is started...i have a the factory alarm that came with the car...does anyone have experience with this...thanks ...this would be just a 3rd key hopefully never used...