Window quest ion

Does anyone know what this is? It’s at the bottom of a few windows, average to below average quality windows. Could it be a stop?

Thanks in advance.

Was there a same size hole in the bottom of the sash for extra security? Can’t imagine it being a just a stop…never be able to lock the window.

magnetic alarm sensor
probably voids window warranty
sealant has failed & moisture intrusion will occur

Thanks Barry and Brad for the responses.

Barry, I think it is indeed a magnetic sensor. I used to be an alarm installer 30 years ago. I would have never thought it would be installed in the bottom part of the window !!!

What Barry said. They are very common in the Houston area and done on brand new construction all the time.

Will, on the bottom? Or the side? One would have to look for them on the (upper) side.