Choose the clearest and most concise restatement.
1-The last two things are to activate the alarm and pull down the shutters.
2-'The shutters and alarm are the last two steps before you leave.'
3-'The shutters should be pulled down and the alarm should be activated before you leave.'
4-'Activate the shutters and the alarm before you leave.'
5-Just before leaving, pull down the shutters and activate the alarm.'