Entry and exit loops, that are buried wires linked to a special machine in your gate operator that acts to be a swap to open or close your gate AutoGate Northern Ireland www.ElectricGatesNewry.com 07855-781433 02830-886666 Contact Adrian for help, advice or information on Electric Gate Installation or Electric Gate https://automaticgatesnorthernire86283.fireblogz.com/59302035/are-you-searching-for-automatic-gate-cost-then-call-adrian-on-07855-781433-professional-reliable-help-with-automating-new-or-existing-gates