Stair Climber S715 SportsArt status series stepper are self-generating; no-outside power source required. The contact heart rate is standard and a wireless Polar® HR receiver is built in, multiple language options are included (English, Spanish and French) Horizontal and vertical handrails accommodate a variety of hand positions Self-leveling non-skid foot pedals Silent, automotive grade poly-v belt drive system is exceptionally smooth and requires less maintenance than many other drive systems Self-generating, no outside power source required consumption while product is idle Overall Weight Resistance Level Maximum User Weight FEATURES AND SPECIFICATIONS FEEDBACK. Distance , Time , Total steps , Calories per hour , METS , WATTS , Resistance Level , Steps per minute , Heart rate ACCESSORIES CSAFE port (standard) HR transmitter belt (Optional) Contact heart rate (standard) WORKOUT PROGRAM Random (x10,000) , Cardio HRC , Weight Loss HRC , Hill (x3) , Interval (x3) , Manual , Quick Start Power Requirement Cordless, self powered design