Easy set-up, simple storage, major results. The Black Concept 2 Model D Rower has helped set the new standard for what a 21st century indoor rowing machine can deliver. Overview of the Concept 2 Model D Rowing Ergometer: Features an advanced PM5 Performance Monitor, improved ergonomically designed handles, adjustable foot-rests, and a flywheel designed for smooth movement with minimal noise. The Model D has a comfortable 14" (seat) height with an aluminum I-beam monorail and stainless steel track for a consistent back-and-forth slide. Quick break down of the rower into two segments for storage or use the included caster wheels for easy transport. The Concept 2 Rower provides one of the more comprehensive, full-body workouts of any fitness machine. Engineered to last a lifetime, it's low impact enough for use in physical rehabilitation centers, and intensive enough to be used by the world's fittest athletes. PM5 PERFORMANCE MONITOR The PM5 is another leap forward in what a performance monitor can do. Track distance, speed, pace, calories burned, and watts—all presented on a clear, backlit display. Connects to wireless heart rate monitors and via bluetooth to the optional ErgData app to track detailed workout data. The monitor itself can be custom positioned using the adjustable monitor arm. USB flash drive compatible and built for machine-to-machine racing. FLYWHEEL AND DAMPER The Concept 2 uses air resistance generated by the fanned flywheel. To adjust how much air enters the flywheel housing on each stroke, the Model D Rower includes a unique spiral damper adjustable from a setting of 1 to 10. This functions much like the gears on a bike, affecting how much energy will be needed to accelerate from one stroke to the next. 10 allows in the most air for more wind resistance. For most people the recommended settings is from 3-5. DURABLE CONSTRUCTION, COMPREHENSIVE WARRANTY Designed to last, the Concept 2 rowing machines offer a comprehensive fully transferable warranty. From home gyms, to Olympic training centers, to major professional sports teams, Concept 2 has been put to the test time and again. STORAGE AND MOBILITY The Model D is mobile, and easy to store. You can quickly breakdown the entire unit into two compact sections using the quick release, framelock mechanism (no tools needed), and caster wheels enable the easy movement of the entire rower from one end of a gym to the other. FREE ASSEMBLY