Voice Alert

Keeping your eyes on the road is hardly the sort of advice you need; you already
know that anyway. But what if you drive past a Home Depot every day that has
an X Band radar door opener? Then, one nice day a conniving cop parks nearby
with his Ka Band gun. A voice alert would say “Ka Band”. Without having to
take you eyes off the road you’ll know immediately that something’s up.
 

Ku Band Detection