Farmingdale defense contractor Telephonics Corp. has won a $13.5 million contract to deliver ground surveillance vehicles to the U.S. Customs and Border Protection for use on the border with Mexico.

The agency has been evaluating two Telephonics ground surveillance vehicles for more than nine months.

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The vehicles use radar and optic sensors to track and classify small and slow-moving targets, the company said.

The contract includes systems deliveries and logistics support.

In a statement, Telephonics CEO Joseph Battaglia said that the vehicles provide border patrol agents “with a suite of advanced sensors integrated with a sophisticated decision-making tool set, to successfully detect, classify, track and ultimately apprehend lawbreakers at our borders.”

Shares of Griffon Corp., the Manhattan-based parent of Telephonics, fell 3.35 percent to close at $14.99 in New York Stock Exchange trading Tuesday.