Short-range wireless sensors are experiencing rapid growth in wide range of applications: RFID to GPS tracking, traditional automatic meter reading (AMR) plus advanced metering infrastructure (AMI), mesh networks, system control and data acquisition (SCADA), data loggers, measurement while drilling, oceanography, environmental systems, emergency/safety systems, military/aerospace systems, and more.
http://m.electronicdesign.com/power/power-your-wireless-sensors-40-years