Gikfun NRF24L01 2.4GHz RF Wireless Transceiver Module for Arduino (Pack of 2pcs) EK1092x2 NRF24L01 is a single chip radio transceiver for the world wide 2.4 - 2.5 GHz ISM band Transceivers integrated module , transmit or receive can not be simultaneously by one module. Pack of 2pcs Arduino and Raspberry Pi compatible Applications: wireless peripherals, remote control systems such as RC vehicles and consumer remote electronics, wireless voice transmission such as VoIP, wireless sensor networks, wireless networks, home and commercial automation