The ANNA-B1 is a miniaturised variant of the popular u-blox NINA‑B1 BLE module in a SiP with a footprint of only 6.5 x 6.5 x 1.2 mm. ANNA-B1 is powered by an Arm Cortex-M4 MCU with FPU, Flash and RAM. The CPU has an open option to allow custom applications to be run. Developers can also leverage pre-flashed u-blox software, which is certified and contains a GATT client and server, Serial Port Service, simultaneous peripheral and central role, and NFC technology to quicken time-to-market. The device can use the built-in antenna or use an external one.