Variable speed for greater versatility. High performance motor for maximum performance at all speeds. Electronic feedback for consistent speed under load. Can be used with all Dremel accessories and attachments. Specs: Cord length 6', speed 5,000 to 35,000 rpm, voltage 120 AC/50-60 Hz, weight 18.8 oz. Includes: Dremel 4000 rotary tool, circle cutter/straight edge guide, sanding/grinding guide, storage case, quick start book.