Bluetooth module
The Bluefruit LE UART Friend makes it easy to add Bluetooth Low Energy connectivity to anything with a hardware or software serial port. We even have nice hardware flow control so you won't have to think about losing data. Connect to your Arduino or other microcontroller or even just a standard FTDI cable for debugging and testing. (https://www.adafruit.com/product/2479)
HC-05: https://components101.com/wireless/hc-05-bluetooth-module
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