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The ActiGraph ActiTrainer activity monitor provides heart rate information in addition to activity measurements such as activity counts and vector magnitude, energy expenditure, steps taken, activity intensity levels, and subject position. When worn with the Polar T31 chest strap and transmitter, heart rate information is wirelessly transmitted to the device and appears alongside activity data. The ActiTrainer also features an OLED display window for real time activity and heart rate monitoring and an ambient light sensor to provide information on subject environment. The ActiTrainer has 4MB of non-volatile memory, and its rechargeable battery is capable of providing power for 7 days with the display enabled or 10 days with it disabled.