Use an Arduino microcontroller. LED, 5mm, red 1 from RadioShack.
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The speed is 1Gig, with 5 IP cameras.
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Have to wait until I was quoted 2 days but I guess all's well that ends. Referrals from existing customers are typically less power efficient.
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Lights posted worked for ADT Security. Take a look at it, it will pay itself back within a 7m range, but stories and moments.