Rising demand for sophisticated school and college lockdown systems helped boost NAPCO Security Technologies Inc.’s fiscal second quarter net earnings by 3 percent from a year earlier.

The Amityville maker of security and fire alarm devices said net sales in the three months ended Dec. 31 were $20.5 million, up 5 percent from a year earlier and a second quarter record.

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Net income was $976,000, or 5 cents a share, up from $951,000 or 5 cents a share.

Richard Soloway, chairman and president, said, “In schools and colleges, we are seeing a push by local and state lawmakers to increase school safety requirements.” They include systems with video surveillance and those that can effect a lock down electronically in seconds, he said.