Researchers in Turkey described an implantable biosensor that uses genetically engineered E. coli to detect molecular signals in vivo and transmit data wirelessly without external batteries. The device architecture pairs microbial sensing circuits with a readout system to enable autonomous, long‑duration monitoring. Developers reported proof‑of‑concept demonstrations of molecular‑level tracking and emphasized the battery‑free, self‑sustaining design. The work was presented as a next‑generation approach to continuous biomarker monitoring within the body. As a technical note, the system leverages engineered microbial gene circuits that convert molecular detection into measurable electronic or optical outputs—an approach that blends synthetic biology with implantable device engineering.