DEWALT DCST990M1 40V MAX 4.0 Ah Lithium Ion XR String Trimmer Includes 40V MAX 4.0Ah Lithium Ion Battery, along with charger Patented gear drive design housed in a metal gear case for durability Full variable trigger allows you to have control over the speed and noise Bump feed 0.080" dual line 15" cutting swath *Maximum initial battery voltage (measured without a workload) is 40 volts. Nominal voltage is 36