The Black & Decker 6.0 Amp Accu-Trak Saw with Smart Select Technology features the Smart Select Dial to easily adjust saw settings between accurate straight cuts and intricate curved cuts. It has a turn dial to extend straight cut guide which rides in the saw"s cut line to help ensure accurate straight cuts. Retract the guide for easy handling of curved cuts. It has an integral dust blower that keeps the cutline clear for better visibility. It also has a rool free blade release for quick and easy blade changes. It has a lightweight and compact design for ease of use. The straight cut mode is perfect for long straight cuts in wood like plywood or shelving. The curved cut mode allows for intricate cutting, excellent for craftwork. This saw cuts a variety of materials including wood, metal,and plastic.