The Dual-purpose Black+Decker BHFEA420J-QW Cordless Vacuum Cleaner features a 500 ML tank, a 14.4 V lithium battery, and Smartech technology. Description of the product The 14.4 V lithium-powered cordless 2-in-1 vacuum cleaner, which is a part of the BLACK+DECKER cleaning series, has Smartech technology: the rotating brush automatically adjusts to the