I bought 2 packs of WindowAlert, and I wish I can return them. These decals are useless. After I placed them on the glass windows and doors in my patio that has a lot of sunlight, the birds kept hitting the windows and doors. In cloudy days and in the shady areas around the sunroom, the decals are invisible. The visibility from the outside is very dim even within a distance of 3 feet. I do not recommend this product. Placing a white tape in geometric figures in the outdoor glass is more effective. Since I put the tape, the birds can see very clearly the figures on the glass from the reflection of the yard. I don’t hear a “thump” anymore. Don't waste your money on these decals.
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WindowAlert is a window decal that may be applied to home and office windows. The decals contain a component which brilliantly reflects ultraviolet sunlight. This ultraviolet light is invisible to humans, but glows like a stoplight for birds.
