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Target localization and tracking problems in Wireless Sensor Networks (WSNs) have received considerable attention recently, driven by the need to achieve high localization accuracy, with the minimum cost possible. A wide range of proposed approaches regarding the localization area have emerged, however most of them suffer from either requiring an extra sensor, high power consumption, inaccessible indoors, or offer high localization error. This paper presents a research and development of a hybrid WSN tracking system using the Received Signal Strength Indicator (RSSI) and the inertial system. The proposed system is an efficient indoors, where it offers reasonable localization accuracy (0.1 – 0.7) meters, and achieves low power consumption. A number of real experiments have been conducted to test the efficiency of the proposed system using XBee modules.