The Black & Decker LST136 13-inch 36-Volt Lithium High Performance Cordless String Trimmer uses a 36V lithium battery for a long runtime and plenty of power. It has a PowerCommand dial to choose between max power to tackle thick weeds and max runtime to increase battery life. The PowerDrive Transmission delivers more power from the motor to the cutting string so you can get the job done faster and the Automatic Feed Spool ensures continuous work without bumping and having to stop to adjust the spool. The trimmer easily converts to an edger with a turn of the shaft. Includes one battery and a Fast Charger (about 1 hour), spool, guard and Auxiliary Handle.