Model DUB361 is a cordless blower powered by two 18V Li-ion batteries in series. Powered by two 18V Li-ion batteries in series to supply energy to the powerful 36V DC motor drive system - 2x 18v batteries will power the 36v DC motor. The 36v DC motor delivers more power and run time without leaving the 18v Lithium-ion platform. When different capacity batteries are used together (for example, 4.0Ah BL1840 and 3.0Ah BL1830, or fully charged BL1830 and 70% charged BL1830), the machine stops when the battery with less capacity is empty. * Twin 18v machines must have two 18v batteries connected and with charge before they will operate. Other features include: Battery capacity warning lamp. Push button for high/low volume settings. XPT (eXtreme Protection Technology). Compact Lightweight. Low noise emissions.