With the patented Tandem Air System, the Premium Synergy cleans circles around the competition. Twin ultra-bright LED headlights light up every dark corner, plus a Heads Up™ dirt sensor display shines on the cleaning path to let you know when the Premium Synergy has found deep down dirt and is pulling it out of your carpet. Two motors work in tandem to lift more dirt and allergens than ever before from your carpets and floors. Dust is trapped in Synergy’s 100% sealed system and 7 layers of filtration including a self-sealing HEPA media bag, HEPA media filter and a granulated charcoal filter. The Synergy premium has a belt that never has to be replaced and metal where it matters, in high-wear areas like the bottom plate, brushroller, handle tube and wand.