How close to the iPad do students have to stay?
The maximum coverage of the iPad is approx. 60 meters / 66 yards. Any obstacles, such as walls, between the heart rate sensor and iPad reduce signal range.
The transmission range with Polar heart rate sensors H6, H7, H10 and OH1, and Flow-based Polar devices A360, A370, M200, M430 is 5 meters (16.4 ft) at the minimum in optimal conditions. Typically the range varies between 10 to 35 meters (32.8 to 114.8 ft), and in extremely rare top outdoors conditions, on an open field, the range can reach even up to 100 meters (328.1 ft). There are several variables that affect the range and therefore an exact range cannot be stated. The best range is achieved with line-of-sight positioning between the sensor and receiver.