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              <p>We present AcouBLE, the first system to significantly reduce the BLE tag's RF front-end energy consumption while preserving standard BLE operation, backward compatibility, and one-to-one deployability. At its core is clock-seeding, a new paradigm that offloads the generation of the high-frequency MHz clock from the energy-constrained tag to the central (smartphone). The smartphone transmits a low-frequency audio signal that the tag transforms into a clean, ultra-low-jitter reference clock-eliminating the most energy-expensive component of a BLE connection event.&lt;p&gt;Our design combines a novel digital-analog upconversion pipeline that converts a kHz audio tone into a stable 32 MHz clock with a lightweight feedback protocol to implement clock-seeding on commodity BLE chips without modifying the BLE stack or requiring privileged access on the central. A full prototype demonstrates up to 5.9X energy savings in Connected mode, while maintaining RF performance, seamless deployability, and backward compatibility.&lt;/p&gt;</p>
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