PORTER-CABLE 20-Volt Max 1/4-in Variable Speed Brushless Cordless Impact Driver (2-Batteries Included)Brushless motor provides 50% more run time Powerful motor provides 1,400in lbs of torque for large fastening applications Transmission provides 2,700 MAX RPMs for speed of fastening applications 1 4 in quick change hex for 1 handed quick and easy bit changes Compact size at 5. 8 in for work in tight spaces Lightweight at 2. 9 lbs for reduced user fatigue Features Battery Amp Hours 1. 5 Battery Type Lithium ion (Li ion) Maximum Chuck Size 1 4 in Drive