Average Reviews:
(More customer reviews)WindowAlert Decals are thin plastic shapes that stick to the outside of windows and reflect UV light, so birds can see them, but they're inconspicuous to humans. The idea is to prevent or reduce window strikes without festooning your windows with unsightly paper and whatnot. The decals are supposed to look like frosted or etched glass to humans while appearing bright and solid to birds, because birds see UV light in addition to the parts of the spectrum visible to humans. In reality, the decals sometimes appear purplish and sometimes are nearly transparent, depending upon how the light is striking the window.
There are 4 decals per package. The instructions recommend placing them a few feet apart on the outside of your windows, making sure to put some where sky or open space is reflected, which would tend to be a bird's line of flight. The decals must be applied to the outside of the window, as they will be reduced to only 25% effectiveness if applied to the inside (most UV light does not penetrate the glass). They cannot be used on windows that have overlays, such as external tinting. They can be removed and reused; just rinse with warm water. You could clean the window without removing them, but you're likely to have trouble around the edges of the decals.
I bought the snowflake design on a lark, because I had previously taped paper snowflakes to my sliding glass door to deter birds. The four snowflakes are different designs, ranging 3 ?-4 inches in diameter. Maple leaves, butterflies, and hummingbird designs are also available. The leaves and butterflies stick to the window with no adhesive, like the snowflakes. The hummingbirds use a "low tack" adhesive and may be more difficult to remove. The others peel off easily. They're easy to apply to clean glass. If the glass is very cold, it may help to warm it up with warm water first. Then apply the decals and push any air bubbles out.
WindowAlert decals work just as well as solid objects stuck to the window, but they let the light through and are not so unsightly. The UV reflective coating does fade with light exposure. The instructions recommend replacing the decals every 9-12 months. I had one window strike after 9 months of use, and I noticed that the purplish cast had faded. So it's probably best to replace them regularly. Be sure to buy enough of them. I needed 2 packages to do the center section of a sliding glass door. WindowAlert is made by Schock Logistics, Inc, which also makes bird feeders, boxes, and bird-themed toys.
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Product Description:
Our decals contain a component which reflects ultraviolet sunlight.This ultraviolet light is invisible to humans, but birds see it as a brilliant glow - much like a stoplight.To the human eye, the decals appear as frosted or etched glass. The decals measure approximately 4" across, and are designed to be placed on the OUTSIDE of a window.As a rough guide, we recommend 1 decal for every 3' x 3' section of glass.CONTENTS: 4 Decals per Envelope.
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