The groundbreaking DX3 Belt and Deck System combines a lubricant-infused belt, Advanced Belt Tracking System (ABTS) and the patented FlexDeck Shock Absorbtion System for the ultimate in durability and comfort. Heart Rate Monitoring Lifepulse digital heart rate monitoring hand sensors are conveniently placed on the easy-to-grip Ergo bar to provide walkers with precise heart rate monitoring, and Polar telemetry provides runners with accurate, "hands-free" heart rate monitoring. (Telemetry requires optional chest strap.) Rapidworks Service Enhancements Maintenance is fast and easy with Auto Alert diagnostics that inform you of service needs and permanently record and date-stamp maintenance performed. Readouts: Speed, Incline, Heart Rate, Elapsed Time, Distance Climbed, Calories, Calories Burned, Watts, METS, Language Choices: 7, Custom Messaging, Work Out Profile Programs: Quick Start, Manual, Random, Hill, Cardio, Fat Burn, Heart Rate Hill, Heart Rate Interval, Extreme Heart Rate, Army PFT, Navy PRT, Air Force PRT, Marine PFT, Fit Test, WFI Submax Protocol, Physical Efficiency Battery (PEB), Custom Workouts (6), 5K Sport Training, 10K Sport Training, Speed Interval Training, Calorie Goal, Distance Goal, Time in Zone Goal, Customized Cool Down. Integrated Reading Rack Speed Range: 0.5 - 14 mph Elevation: 0% - 15% Running Surface: 20" x 60" Rollers: 3.5" precision crowned steel rollers, front & back Electrical receptacle & plug: NEMA 5-20R 120v Electrical requirements: 20 amps, dedicated circuit required, non-looped grounded Step-up Height: 11" Headphone Jack: 3.5 mm Stereo TECH SPECS Max User Weight: 400 lbs (181.5 kg) Weight: 425 lbs (193 kg) Dimensions: 83" L x 37" W x 62.25" H / (211 x 94 x 158 cm)