TRS-2 PEWS Seismic Intrusion Detector Set, Unissued, Function-Tested Only. Consists of: R-1808 V(3) Receiver, Wireline Adaptor, Detector/Transmitters, DT-577 V(3), 5 Each., Ground Spikes, Antennas, Batteries, Manual. 2 of the sensors work in Wireline Mode only. $1500/set