secure1 on Need Fail Secure Door Strike

I've sent emails to support but no response. I'm hoping someone looks here as I bought two door strikes that are advertised as fail-secure but they are unlocked when there is no power: ACDS-DX1500SE and ACDS-DX1500SE-L. Both work when the power is on, but when power is removed from them, they are open/unlocked.

First, are these the correct locks and if so, is there something I Need to do to make them fail-secure?

Thanks!