The DVC665U is a cordless backpack vacuum cleaner powered by two 18V Li-ion batteries in series to supply energy to the powerful 36V DC brushless motor drive system. It features Auto-Start Wireless System (AWS) which offers wireless connection to the power-tool via Bluetooth. This enables power take-off of the dust extractor when using a cordless power-tool. Mode memory function allows start-up in the same suction power as when you turned it off previously. The DVC665ZU is also extremely low noise when in use. This model is equipped with Battery Protection Circuit, designed to protect the battery from damages due to overdischarge, high temperature or overload current. The design includes a large dust bag capacity whilst the unit is equipped with HEPA filter. The controller is equipped with a belt clip that clips onto the waist belt of comfortable and fully adjustable harness. It is also operable in hand for on/off switching and high/low power selection