Please note this product has been discontinued.  The Dakota 3000 series has been replaced by the Dakota 2500 series with up to 2500 foot range.  Dakota 2500 and 3000 series are not interchangeable so any existing transmitters and receivers will need to be replaced with the newer 2500 series.

The new part# is DCRH2500

https://www.absoluteautomation.com/dakota-2500-airhose-alarm/