BRUSHLESS MOTOR, 1/2’’ SQUARE TOOL HOLDER, ELECTRONIC SPEED ADJUSTMENT, STEP SPEED SELECTION, REVERSE ROTATION, BUILT-IN LED LIGHT (4 LIGHTS), BELT CLIP, VARIABLE TORQUE: 300 NM / 400 NM / 500 NM / 550 NM, ADDITIONAL ANTI-VIBRATION HOOK FOR 4AH BATTERY, MAGNESIUM HEAD FOR BETTER HEAT DISSIPATION, EFFICIENT VENTILATION SYSTEM FOR ENGINE COOLING