Dual voltage works with both the Ridgid 3.0Ah Lithium and 2.5Ah Ni-cas batteries. Push on push off switch lock makes this unit easier to actuate and more user friendly. Overmold handle and front rubber boot for better grip and comfort. Tool free blade clamp makes blade changes faster and easier. Variable speed switch for easier control and precise starts. Tool free adjustment allows adjustment of shoe with one hand.