m mMotion Sensor detects motion when there is motion in front of the sensor, and  there are some motion sensors by type, which include infrared light sensor, supersonic wave sensor and RF type. Among them, RF type has the high performance in detecting motion. Each motion sensor is used by its advantage: while infrared light sensor is used for apartment entrance and invasion detection, supersonic wave sensor is used at automobile tail. m mRF type has not been used widely worldwide yet because this is a technology, which is little known to us yet.  The advantage of this sensor is to detect nonmetal through penetration, and has the property to operate without any influence by temperature, sun shine, humidity and dust. m mBy utilizing this property, if lighting works at public restroom only when people use it, or at underground parking lot only when people go in and out, this application can save electric energy for restroom and underground parking lot by maximum 70% or more than 60% respectively. m

m Thus, RF type sensor is a perfect fit for low carbon green growth age as one of sustainable management products.