Specifications include, but are not limited to: Treadmill Heavy-use Commercial Grade Unit must have user capacity up to 500lbs for running, up to 800lbs walking. Belt & Running Surface are Individual Vulcanized Rubber Slats Curved Track Self-Propelled (Human Powered) Heart Rate Monitoring- Polar Compatible Units Drive System: must be energy efficient drive system, 114 precision ball bearings with 12 roller guides (4 mm lateral tolerance) Must be authorized dealer Warranty: 5 years of drive train, motor & running surface and three years on all components and 1 year on labor Treadmill Heavy-use Commercial Grade Unit must have user capacity up to 500lbs for running, up to 800lbs walking. LCD Screen with Fitness Testing, Workout Programming Belt & Running Surface are Individual Vulcanized Rubber Slats 120V AC Power Elevation 0%-15% Speed 0%-12.5% Heart Rate Monitoring- Polar & Garmin Compatible Has USB Power Supply Units Drive System: must be energy efficient drive system, 114 precision ball bearings with 12 roller guides (4 mm lateral tolerance) Must be authorized dealer Warranty: 5 years of drive train, motor & running surface and three years on all components and 1 year on labor