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The Arduino Primo Core is a low-power version of the Primo that can run on the power of a coin cell and is ideal for use as a wearable device, as well as being able to be mounted on a breakout board.
The Primo Core uses the Nordic nRF52, which has Bluetooth Smart (BLE 4.0) and NFC-A tag functions. The board also features integrated sensors for humidity and temperature, and a 3-axis accelerometer.
For increased versatility in developing IoT applications, it is hard to beat the Primo Core. Coin-cell power for portability, small size for wearable or portable use, and functions and performance that are typified by the high spec Nordic microcontroller, make this device hard to beat.