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Amazon has the Dyson Pure Cool Link Tower Air Purifier on sale for $268.99. When it isn't on sale, this gadget sells for $500. It received 4.2 out of 5 stars from 344 customer reviews. Today's deal beats the last one we posted for this item by $100.

This device is both a fan and an air purifier. It automatically detects your home's air quality, and adjusts itself as needed to remove allergens and pollutants. You can also control it with your smartphone using the Dyson Link app. There's even a special mode for nighttime, where this will continue to monitor the air and react when necessary, but at the quietest setting so as not to disturb your sleep. Your purchase is backed by a two-year warranty as well.

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