Patent ID: 8301254

Claim:
An ambulatory monitoring device, comprising: a) a battery power source; b) a sensor powered by the battery and configured for monitoring a physiological signal of a subject; c) a wireless receiver that uses less than 10 micro-amps of current from the battery power source when operating and is configured to receive wireless communications from a remote device within a first frequency band of a range of frequencies below 1 MHz when the monitoring device is at least 1 meter from the remote device; and d) a wireless transmitter powered by the battery and that is separate from the receiver, e) wherein after receipt by the receiver of a first wireless communication from the remote device at the first frequency band, the wireless transmitter is configured to transmit a second wireless communication in a second frequency band of a range of frequencies above 10 MHz, and wherein the second wireless communication is of the physiological signal sensed by the sensor.