Adafruit Circuit Playground Blue Fruit – nRF52840

Adafruit Feather nRF52840 Sense [ID: 4516] (M4F, IMU, PDM mic, BMP280, LSM6DS)

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Adafruit RGB Matrix Featherwing Kit - For RP2040, M0 and M4 Feathers Part # 3036

Adafruit Feather NRF52840 Express Bluetooth 5 Module

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Adafruit RGB Matrix FeatherWing Kit For NRF52840 Feather, Sense, LED Panels 4702