Concept2 Model D Indoor Rowing Machine with PM4 Monitor PM4 monitor provides wireless heart rate monitoring, machine-to-machine racing, and increased memory capacity with rechargeable battery pack 14-Inch (35.6 cm) seat height and nickel-plated chain Separates easily into two pieces for storage with a quick-release frame lock. Caster wheels make it mobile Adjustable footrests accommodate a wide range of shoe sizes. Ergonomic handle for natural position Requires footprint of 9 x 4 feet; 500-pound capacity; 5-year frame warranty PM4 monitor provides wireless heart rate monitoring, machine-to-machine racing, and increased memory capacity with Rechargeable battery pack 14-Inch (35.6 cm) seat height and stainless steel chain Separates easily into two pieces for storage with a quick-release frame lock Caster wheels make it mobile Requires footprint of 9 x 4-Feet 500-Pound capacity 5-year frame warranty