I mean, a ditzy little plastic pin that is extremely hard to pull out, and that breaks when you apply the slightest pressure to it.

No pins for attachment to whole home alarm, rendering it useless.

It has a battery compartment held closed with the cheapest possible plastic pin.

Without the pin the alarm easily twists on to the base but can also easily twist off (vibration could easily loosen it and have it fall off without warning.)

My bad as I waited too long to return.