Wireless module operating voltage is generally 3.3v, while the ordinary 51 microcontroller 5v, <br>this module is easy to shop wireless module with 51 single system board used in conjunction. <br> This module can be any one of 51 shop is directly connected to the system board, easy to use. <br> It's for 8 Pin NRF24L01+ Module. <br> This is a simple socket board which is for NRF24L01 Wireless module. <br> on-board AMS1117-3.3 chip. <br> It could be used with NRF24L01 Wireless module at our store. <br> Package included: 5pcs Socket Adapter Module