Patent ID: 8264328
Filing Date: 2012-09-11
Classification: A61B,G01C,G06F

Abstract:
1. A method comprising: (a) operating a first device in a first operational mode in which a sensor and a transmitter are used at least occasionally to obtain and transmit sensor data to a second device, the sensor data being a measurement of athletic performance; (b) determining, by the first device, that a battery has reached a low power threshold that is a function of power consumed by the transmitter to transmit a beacon signal for a predetermined number of times; and (c) in response to determining that the battery has reached the low power threshold, operating the first device in a second operational mode wherein the sensor is not used, but wherein the first device at least occasionally causes the transmitter to transmit the beacon signal to the second device; wherein the transmission of the beacon signal occurs periodically for a period of time subsequent to detection of a stimulus by a transducer or to detection of user input.