Performance monitor - The series 4 performance monitor has been designed to balance technical sophistication with user - friendliness * The monitor has 6 information and programming windows, 6 quick selection buttons and 3 navigation buttons * It displays workout intensity, stroke rate, heart rate, zone bar, duration, and distance * Compatible with the optional WaterRower heart rate chest strap and receiver * Dimensions: 21" H x 22" W x 83" D; weight 200lbs