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We have developed low power technologies for animal or human health monitoring system with wireless sensor node. A wireless sensor network system is composed of sensors, signal processing units, receiver and other components. Although there are several reports of low power technologies for these components separately, the technology which has consideration of a total system has not been researched. For example, if we use the combination of a wireless sensor node and a receiver, the number of receiving per a time can be utilized as measured data indirectly. In this case, since the transmitted data can be decreased, the power consumption of the transmission can also be decreased. In this paper, we report low power technologies of wireless sensor network system which was developed for chicken health monitoring system. The calculated average power consumption of the wireless sensor node is less than 1 μW.