nemtek-fence-light-galvanised-and-aluminium-grey-smk-security-hardware-nemtek-fence-light-galvanised-and-aluminium-grey-nylon-line-light-(10-pack): a-bulk-set-of-specialized-led-indicators-that-clip-onto-the-fence-wire-to-provide-a-visual-"active"-signal-along-the-perimeter.