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Abstract – Wireless Sensor Networks are being gradually introduced in different application scenarios. ZigBee is one of the most widely used transceiver standard in wireless sensor networks. ZigBee over IEEE 802.15.4. , defines specifications for low data rate WPAN (LR-WPAN) to support low power monitoring and controlling devices. This paper presents a detailed study of Zigbee wireless standard, IEEE 802.15.4 specification, ZigBee device types, the protocol stack architecture and its applications.