A method of monitoring an enclosed environment includes disposing a sensor assembly in an environment enclosed by an enclosure, where the sensor assembly includes a transmitter configured to communicate using near-field magnetic induction. A receiver is disposed outside the enclosure and configured to communicate with the transmitter using near-field magnetic induction. The receiver is to a communications device. The sensor assembly detects a sensed condition of the environment enclosed by the enclosure. The transmitter communicates the sensed condition to the receiver using near-field magnetic induction. After receiving the sensed condition from the receiver, the communications device communicates the sensed condition to a user.