iLabs Challenger+ RP2350 NB-IoT Brings Cellular Connectivity to the Feather Form Factor iLabs pairs the RP2350 microcontroller with STMicro's ultra-low-power NB-IoT and GNSS module in a Feather-sized board that sleeps at just 0.5 uA. Devices Raspberry Pi Rp2350 2026-04-22