defaulting ENVL4?

[jagreenough]

Hi,
we're selling our house and want to default the ENVL4 DSC before close. what exactly does defaulting do?
i'm assuming it deletes the user set password on the card, at least. Does it do anything to a DSC board and it's programming? (hope not).
Then i plan to delete the site (my house) from my account and delete the mobile app from my phone.
Are there other potential things to worry about?
thank you,
jeff