Procera Networks (NASDAQ:

) shares declined 25.73% to $6.35 in pre-market trading after the company announced weak preliminary Q3 sales and issued a downbeat full-year forecast. Analysts at Stifel Nicolaus downgraded Procera Networks from Buy to Hold and removed the price target of $15. VOXX International (NASDAQ:

) shares slipped 16.45% to $6.40 in pre-market trading after the company reported a Q2 loss of $0.11 per share on revenue of $177.30 million. Microchip Technology (NASDAQ:

) fell 11.07% to $40.50 in pre-market trading after the company lowered its sales forecast for the second quarter. Tesla Motors (NASDAQ:

) shares dropped 5.74% to $242.26 in pre-market trading following the announcement of all wheel drive car at the Thursday event.