Makita BTD140 LXT 18-Volt Lithium Ion Impact Driver Kit LXT Lithium-Ion battery and optimum charging system produces 280% more lifetime work with 2x more cycles. Makita built 4-pole maximum torque motor delivers 1,280 in. lbs. of efficient torque in a compact size. 50% more compact design at only 5-3/4" long and weighs only 3.3 lbs. for less operator fatigue LXT Lithium-Ion provides longer run time, 5x lower self-discharge (for use any time) and 16 firm holding contact terminals (for constant high power) Makita's proprietary hammer and anvil are made using the highest quality steel and heat hardened to last longer.