This 3.3V VCC Adapter Board for NRF24L01 Wireless Transceiver Module enables you to use NRF24l01 type transceivers on 5V systems like Arduino.It regulates the 3.3V input to 1.9~3.6V DC and incorporates bypass capacitors for reliable operation. The NRF24L01 utilizes Enhanced ShockBurst (ESB) protocol..