Shark Navigator Lift-Away Zero-M Speed ZU561. Model #ZU561. Brand New. The next-generation Shark Navigator lightweight upright vacuum includes the Zero-M cleaner head, which actively removes hair wrap from the brushroll. Its lightweight design and Lift-Away technology make it easy to clean stairs, furniture, and other above-floor areas. Anti-Allergen Complete Seal Technology® traps dust and allergens inside the vacuum cleaner. Swivel steering provides effortless maneuverability on both floors and carpets, allowing for seamless debris pickup in hard-to-reach areas.