Makita XT255MB 18V LXT Lithium-Ion Cordless 2-Pc. Combo Kit (4.0Ah) Drywall Screwdriver with BL Motor delivers 0-4,000 RPM to handle a variety of drywall and framing applications Push Drive Technology - in lock-on mode the motor starts only when the fastener is engaged for a quieter work environment and to save battery power The BL Brushless Motor eliminates carbon brushes, enabling the BL Motor to run cooler and more efficiently for longer life Efficient BL Brushless motor is electronically controlled to optimize battery energy use for up to 50% longer run time per charge 18-Volt LXT Lithium-Ion 4.0Ah battery BL1840B, features an integrated L.E.D. battery charge level indicator (for MB kits)