An Arduino mini pro provides the brains. A FT-232 USB to serial board is used to program the Arduino. A standard Bluetooth module has to have HID firmware installed.

Arduino Uno R4 WiFi comes with built-in Wi-Fi and Bluetooth capabilities, along with additional pins and a new, faster processor.

Connecting via a PCB Bluetooth antenna, the high-performance product operates in industrial grade operating temperature ranges of -40 °C to +85 °C and weighs just 0.57g.