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Optex TD-20U Indoor/Outdoor Wireless Infrared TransmitterUse the Optex TD-20U Indoor/Outdoor Wireless Infrared Transmitter enhance your Optex Wireless 2000 and 1000 systems. With a built-in infrared sensor, this wireless transmitter can send alarm signals up to 2,000 feet back to Optex receivers. The Optex TFeatures of Optex TD-20U Indoor/Outdoor W..