BLACK+DECKER LCC520BT 20V SMARTECH Max Easy Feed String Trimmer and Power Boost Sweeper Combo Kit SMARTECH iOS and Android compatible app enables Bluetooth controls allowing remote battery locking/unlocking, battery locate, state of charge and programmable alerts and reminders Battery contains a built in USB port for charging phones, tablets, mp3 players - (2) LBXR20BT SMARTECH batteries included LSTE525 20V MAX EASYFEED Trimmer/Edger; advances your line with the push of a button - no bumping required LSW321 20V MAX POWERBOOST Sweeper; increased power to clear stubborn debris; up to 130 MPH sweeping easily clears debris Part of the 20V MAX System - 1 System. Endless Tasks. Power for your Style. *Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18. The sweeper provides up to 25 minutes of runtime to complete a variety of tasks