This is ideal to use to power the 3.3 volts for an transceiver nrf24h01. It provided a stable 3.3 votls which is required for the 24h01 if you want a steady connection between the transmitter and the receiver. It is prefer to use that tiny board with 300 or version of 600 mA. So much better than using the 3.3 volts directly from the Arduino that provide only a 30 to 50 mA current depending the Arduino board that you are using. Small board , well construct , then it is easy to integrated to your project.