Avid Power 20V Max Cordless Impact Wrench with 3.0mAH Lithium-ion Battery Features: The high spec motor delivers a max torque of 330 ft-lbs. This Wrench can achieve great impact with a rate up to 2700BPM. You can change the speed of the wrench with the pressure you apply to the trigger. 3.0mAH battery only needs 60-90 minutes charging time. Specification: Max Torque: 450Nm(330 ft-lbs) Rated Voltage: 20V Variable Speed: 0-2000 RPM Impact Frequency: 0-2700 BPM Chuck Size: 1/2 inch Battery Type: Lithium-ion Battery Capacity: 3000mAh Charging Time: 1-2 hours