There are two types of power anomalies natural phenomena which are harder to control and internal anomalies which are easier to control. 일리노이주 로즈몬트에서 열린 센서 엑스포에서 만난 많은 전시업체 중 한 곳으로부터 받은 인사말은 "ZigBee 프레젠테이션을 또 보실 수 있나요? was the greeting I received from one of the many exhibitors I met at the Sensors Expo in Rosemont, IL.