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. Measuring 6.5 by 6.5 mm including its integrated antenna, ANNA-B4 combines the Nordic nRF52833 chipset's feature set with u-blox's expertise in chipset and module design into a compact and powerful component. The SiP supports Bluetooth mesh, long range, and direction finding, Thread and Zigbee, operation up to 105 C, and is globally certified.