Skip to main content

Please note that u‑blox no longer supports Internet Explorer.

We recommend using the latest version of Google Chrome or Firefox.


ANNA-B412 (u-connect)

Stand-alone Bluetooth 5.1 Low Energy module

Ultra-compact module for harsh professional environments

  • Ultra compact SiP (6.5 x 6.5 x 1.2 mm) with integrated antenna
  • Bluetooth 5.1, including Bluetooth long range
  • u-connectXpress software for accelerated time to market
  • Superior security functionality with secure boot
  • Extended temperature range up to 105 °C
  • Global certification
6.5 x 6.5 x 1.2 mm

Product variants


Bluetooth Low Energy module with u-connectXpress software, internal antenna, and antenna pin for external antenna connection

Product variantsANNA-B412
Angle-of-Arrival (AoA)
Angle-of-Departure (AoD)
AT command support
Bluetooth high speed (LE 2M PHY)
Bluetooth long range (coded PHY)
Bluetooth mesh
Extended data mode protocol
Factory programmed MAC address(es)
Low energy serial port service
Secure boot
Simultaneous GATT server and client
Internal antenna
Antenna pin
Short range features 
Chip insidenRF52833
Bluetooth qualificationv5.1 (Bluetooth Low Energy)
Bluetooth Low Energy output power EIRP [dBm]9
Maximum range [m]600
Throughput [Mbit/s]0.8
Maximum number of connections8
Additional standardNFC
Bluetooth profiles and services 
Bluetooth GATT
u-blox low energy serial port service
Microprocessor on board  
Standalone module u-connect
Electrical data 
Minimum supply [V]1.70
Maximum supply [V]3.6
Environmental data, quality & reliability 
Maximum temperature [°C]105
Minimum temperature [°C]-40
Size [mm]6.5 x 6.5 x 1.2

Product Summary

User Guide

Data Sheet

Integration Manual

Interface Manual

Application Note