Each tool in this combo kit is powered by a 20-Volt Lithium Ion battery. The 20-Volt Max* Lithium Ion battery has a longer lifespan and retains its charge 5X more than similar Nicd batteries. The included string trimmer features an exclusive Gear Drive transmission delivering more cutting power to get the job done faster. The included 20-Volt sweeper is light and powerful and easily clears debris from hard surfaces like patios, decks, walks, drives and garages. The hedge trimmer features 22 inch dual-action blades that cut branches faster and easier with 40 percent less vibration. Two 20-Volt Max* Lithium Ion Batteries come in the combo kit.