u-blox Announces Ultra-compact, Feature-rich Bluetooth Low Energy SiP (2021.10.20) u-blox has announced the ANNA-B4 module, a feature-rich, ultra-compact Bluetooth 5.1 system-in-package (SiP). ANNA-B4 targets applications in harsh environments such as smart lighting networks and industrial circuit breakers as well as indoor positioning use cases in manufacturing sites, warehouses, hospitals, and smart cities