Simplex TrueAlert Piezo frequency

For one of our engineering projects, we are creating a system to scare away pests from a garden, and I went to get a few Kingstate KPE-182 piezos since those are used on Simplex TrueAlerts. My question is, what frequency does Simplex power their piezos? It sounds like it is between the 50-100 HZ range doing some testing on it.