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This option is used when you cannot place the standard DA-610TO sensor/xmitter (which comes with the DA-600 and DA-605) right next to the driveway. The DA-611TO allows you to bury the sensor right next to, or under, the drive and then place the transmitter up to 50' away under some landscaping or up a tree or pole (this also helps increase transmission reception). If you want this option, order a DA-600CP or DA-605CP which are the control panels for these systems, AND ALSO the DA-611TO.
DA-611TO Installation Manual