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DSP-22 Two Channel Detector for the DoorKing Operator 

Another switchless two-channel vehicle detector product designed to work with the  DoorKing operators. 

This detector is available with a solid state presence output on channel 1 and a  N.O. and a N.C. relay output on channel 2.

The channel 2 detector also has a switch to operate in either the pulse or presence mode.