bids are invited for 1 procurement siren 1km horizontal 2 procurement of flight safety items ip rated siren switch no / nc 3 procurement of flight safety items high grade insulated 2 core x 2.5 sq mm 4 procurement of flight safety items electrical cable length 40 meters 5 procurement of flight safety items wall mounting clips 6 procurement of flight safety items wire cladding length 80 meters 7 procurement of flight safety items wire cladding clips 8 procurement of flight safety items cable tie 9 procurement of flight safety items board plate for installation of switch 10 procurement of flight safety items waterproofing of the siren