<p>➀ The EU-funded Ambient-6G project (€8.4 million) aims to develop sustainable, battery-free IoT devices using ambient radio waves and backscatter communication, eliminating the need for disposable batteries.</p><p>➀ The technology leverages passive backscatter techniques, where IoT devices reflect and modify radio signals to transmit data, drastically reducing energy consumption.</p><p>➂ Challenges include improving signal processing for weak long-distance communication, with applications in retail (e.g., battery-free price tags) and logistics (real-time tracking).</p>