Features:

• Infinitely Variable Resistance - The benefit of a water resistance rower is that it most closely simulates a boat moving through water. When rowing the resistance is due to the effect of fluid drag acting on the boat. Go faster, resistance increases. Go slower resistance decreases.
  
• Slient Flywheel - Because the patented WaterFlywheel replicates the same physical dynamics as rowing, its operation is just as silent. When the handle is pulled, only the soothing sound of rushing water is heard. The WaterRower M1 HiRise (S4)'s frame also assists in dampening noise and vibration, making this one of the smoothest machines on the market.
• Balanced Tear-drop Handle - The handle of the WaterRower M1 HiRise (S4) is made of aluminum for strength and lightness, with a tear-drop shape that fits comfortably into the palm of the hand to minimize wrist torque - a common cause of tendonitis. Because of its strength and lightness, the drive strap of the WaterRower M1 HiRise (S4) is high-density polyester webbing, guided by nylon pulleys. The drive strap does not wear and is maintenance-free, requiring no messy lubrication.
• Ergonomically Contoured Seat - Supported on all four corners and ergonomically designed to provide maximum comfort, the WaterRower M1 HiRise (S4)'s seat is incredibly stable, gliding smoothly on eight urethane wheels.
• Floating Heel-Rest Design - The Rowing Machine's footboard incorporates the all-new Floating Heel-Rest design. The cup of the heel-rest follows the heel as it rises from the footboard providing stability and comfort from the beginning to end of each stroke.
  
• Tank - The tank of the WaterRower M1 HiRise (S4) is made from polycarbonate, one of the strongest plastics available. It is virtually indestructible. The tank is sealed and can be filled with municipal water via a small opening closed by a stopper. This water typically contains enough chlorine to remain clear for some time.
• Dual Rails - Dual rails are featured on all WaterRowers including the WaterRower M1 HiRise (S4). While attractive, they are designed to absorb sound and vibration, making for a smooth and silent stroke. These rails are part of a frame that can support over 2,200lbs of weight!
• Spragg Clutch - The key to the WaterRower M1 HiRise (S4)'s smooth stroke is its "spragg" clutch that engages instantaneously. Unlike other clutches that produce a jerky or jarring impact somewhere during the stroke, the spragg clutch has no lag in pickup, which means no lower back pain for you.
  

S4 Monitor Features:

• The Series 4 Performance Monitor has been designed to balance technical sophistication with user-friendliness.
  
• The monitor has 6 information and programming windows, 6 QuickSelection buttons and 3 navigation buttons.
  
• It displays workout intensity, strokerate, heartrate, zone bar, duration, and distance.
  
• Compatible with the optional WaterRower Heart Rate Chest Strap and Receiver, the Series 4 Performance Monitor will allow you to optimize your workout, achieve your exercise objectives and encourage you to exercise regularly.