Rentokil window stickers effectively trap flies for up to 52 days. These specially designed window and glass stickers are fragrance and insecticide free, meaning they are ideal for use in kitchens, as well as other rooms in your home. Attracted by warmth and light, flies like to be near the window and are drawn to the sticky surface. Stickers may also be used to catch fruit flies when placed near areas of infestation such as fruit baskets but are suitable for use on glass surfaces only. Warning: Always read packaging before use. If glue comes into contact with eyes, seek medical advice. Keep out of the reach of children.