 The study aimed to assess the accuracy of heart rate measurements taken by a Motorola Droid smartphone when compared to electrocardiogram, ECG, and known in 9560BT pulse oximeters. The results showed that the Droid provided valid heart rates at varying levels of movement free mental perceptual motor exertion. This suggests that the Droid could be used in mobile cell phone delivered health promotion and wellness programs. However, further validation is needed to determine its applicability while engaging in physical movement related activities. This article was offered by Matthew J Brogowski, Martina Mueller, Alexei Vertigel, and others.