Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of VOXX International (NASDAQ:VOXX) were getting tuned out today, falling 18% today after posting disappointing guidance in its third-quarter earnings report.

So what: The maker of automotive entertainment products actually beat earnings estimates with a profit of $0.63 against expectations of $0.50, but revenue came up short. Sales ticked up 1.1%, to $245.8 million, below estimates of $250.5 million. CEO Pat Lavelle said the results were "tracking in line" with expectations, and said that the lowered guidance is a result of exiting certain product categories. Still, he added that "everything is materializing as expected." Management dropped its full-year revenue projection to $825-$830 million, below analyst expectations of $840 million.

Now what: Despite the revenue miss and lowered sales guidance, Voxx said it sees net income growth of 3%-4% next year, roughly in line with expectations. Considering profits are still moving in the right direction, and CEO Lavelle's explanation for the reduced sales guidance is accurate, today's sell-off may be exaggerated. Voxx now trades at a P/E of just 11 and, with auto sales improving, the company stands to benefit. Now may be a smart time to buy.

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Fool contributor Jeremy Bowman has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.