This board is designed to be a thin, Bluetooth®-enabled driver board for our Adafruit LED Glasses RGB LED matrix. That said, it's a perfectly good stand-alone development board for the Nordic nRF52840 chipset, with a very slim design, optional LiPo battery support, a few sensors, and a Stemma QT port for adding other devices or sensors with I2C plug-and-play. https://elecena.pl/product/19518819/adafruit-led-glasses-driver-nrf52840-sensor-board 2021-09-24 https://elecena.pl/product/19518819/adafruit-led-glasses-driver-nrf52840-sensor-board 2021-10-13