Releasing its second quarter figures for the three months that ended Dec. 31, NAPCO announced it had a net profit of $1.5 million compared to $872,000 for the same quarter a year ago — a 70-percent gain. Revenues were up a more modest 8 percent for the second quarter to $17.2 million. Among the contributing factors NAPCO credits with its substantial hike in earnings are improvements to its distribution network, a shift in the product mix toward the commercial/industrial and government markets, and several product introductions, including the “Freedom” code-free alarm system. During the past six months, NAPCO’s earnings have gone up 66 percent while sales are up 7 percent.