They are most likely garage door openers ( Home link )
Those can be programmed to operate certain garage door openers.
A Chrysler Sebring does not have a reset switch.
Sorry, the 2 dr Sebring is actually a Mitsubishi and cannot add keys without a programming tool.
A Chrysler Sebring does not have an inertia or reset switch.
4 door, yes. 2 door, maybe.
6x9s
In order to disable the alarm on the Chrysler Sebring, try putting the key in the driver's door, the passenger door, or the trunk and then unlock all the doors. If this does not work, you may have to take it to a technician.
From the inside of the door. Its a pain.
You should be able to access after removing door panels
replace door latch
The speaker is a 6.5 size for the door.