10PCS NRF24L01 2.4GHz 2Mbit/s Wireless Data Transmission RF Transceiver Module Board 1.9-3.6V For Arduino DIY

modname=ckeditorNRF24L01 is a single chip radio transceiver for the worldwide 2.4 - 2.5 GHz ISM band. Compatible with Arduino and Raspberry Pi.

Applications: wire less peripherals, remote control systems such as RC vehicles and consumer remote electronics, wire less voice transmission such as VoIP, wire less sensor networks, wire less networks, home and commercial automation

Ultra small: 15x29mm (including:built-in 2.4GHz antenna),for easy implementation into designs without additional hardware Auto-acknowledge and auto-retransmit function

You can find several resources available online easily,such as tutorials, data sheets, and notes