21V Lithium‐Ion battery power system (often includes 1–2 batteries and a charger)
Brushless motor — more efficient, longer run time, less heat, and longer tool life
2‐speed gearbox — low speed for high torque, high speed for drilling
Keyless chuck — quick bit changes (typically 10 mm or 13 mm)
Multiple functions — drilling and screwdriving; some models add hammer/impact mode
Adjustable torque/clutch settings — prevents over‐driving screws and improves control
LED work light — illuminates work area
Forward/reverse rotation — for driving and removing screws