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This article delves into the core technology of iBeacon distance estimation, which calculates distance based on the ratio of RSSI signal strength to calibrated transmission power. It provides a detailed analysis of distance estimation algorithms on iOS and Android platforms, including code implementations and mathematical principles, and discusses the impact of Bluetooth versions, frequency, and throughput on ranging performance. By comparing perspectives from different answers, the article clarifies the conceptual differences between 'accuracy' and 'distance', and offers practical considerations for real-world applications.