M18™ Brushless Cut-Off Grinder with Paddle Switch, 4-1/2" - 5" Wheel, 18 VMilwaukee 4 Pole Frameless Motor: Features a robust design combined with rare earth magnets for longer life, more power and more runtime than any brushed competitor REDLITHIUM batteries (not included) deliver more work per charge and more work over the life of the battery REDLINK Intelligence: Advanced overload protection defends against abusive applications and monitors the temperature to prevent damage and ensure maximum tool & battery life Paddle