2-Speed Selections: 1st Speed: 0-1000 RPM, 0-1500 IPM, 180 NM/1593 IN.LBS; 2rd Speed: 0-2200 RPM, 0-2800 IPM, 500 NM/4183 IN.LBS;Forward/reverse Mode: Turn left/right of the rhombus button to be forward/reverse mode which helps you fasten or loosen the screws easily.Autostop Mode: If you turn on the Autostop button, it will stop rotating after working a few seconds even if you keep pressing the trigger. Release and press the trigger again, then it will work again, to avoid the nuts falling off. Note: Only for Reverse ModeProfessional in Details: All-metal gear construction for longer life and durability, rubberized grip for added comfort and reduced fatigue Continuously Variable Transmission The speed is controlled by the force of pressing the button and the shift is smoother 1 * 5.0Ah Batteries The 5.0Ah batteries are rechargeable which could last for a long time.Package Includes? 1 18V Cordless Impact Wrench 1 Battery 6 Sockets(14mm/17mm/18mm/19mm/21mm/22mm Socket) 1 Battery Charger 1 User Manual 1 Carry Case 1 Lanyard 1 drill 2 apron 2 plug 1 cross head