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The RD-04 is a compact motion-sensing radar module developed by Shenzhen Ai-Thinker Technology Co., Ltd. It uses X-band radar technology (centered at ~10.525 GHz) to detect human presence and motion by sensing micro-movements in its field of view. The module integrates radar transmission, reception, signal amplification, and digital processing into a small, low-power board designed for embedded and IoT projects. It is useful for smart lighting, security, and other presence-triggered applications.

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