Bird-reduction unit, also ideal to use in conjunction with complementary products such as the Eagle Eye Nightmare™ Sound System, bird-spikes, netting etc. Silver and gold units are for Starling & Geese infestation. This product is an effective bird deterrent device that harmlessly relocates birds. Birds are irritated by reflected light beams that flash at various angles due to the rotation of the unit. (Eagle Eye Solar – (30W) Kit, Silver and Gold, with battery-backup.