Milwaukee 0490-22 4-Volt Lithium-Ion Screwdriver Kit The 21 position clutch has auto-shut off for improved torque control Heavy-duty 2 speed gearbox provides 200/600 RPM Quick-change chuck for one-handed bit changes Number of Batteries: 2 ; 3.0 Ah Lithium-ion battery for superior run-time and long life Battery fuel gauge displays remaining run-time