A physiologic monitoring device is configured to detect and record signals from the sensor and to wirelessly communicate via the communication interface with a transmitter and a receiver that are disposed outside the housing, and to receive via the communication interface transmissions of commands and data from the transmitter. The device operates in a standby mode and an active mode Transmissions comprise control signals to change the mode of operation that are transmitted by the transmitter at a first frequency in a range of 1 - 10 GHz, and transfers of recorded data from the sensor to the receiver in a range of 400 - 450 MHz.
