RF NRF24L01 Module
There's a wide range of wireless communication protocols available in the market today. You could choose from WiFi, GSM/GPRS, Bluetooth, IR. We also have an RF transceiver available in the market, and each of these protocols has its uniqueness.
This RF module has the NRF24L01 transceiver IC from Nordic Semiconductor that operates in the 2.4GHz band. This module has 2.4GHz license-free ISM band operations worldwide, can define the data transfer rate with 250kbps, 1mbps, and 2mbps. Since it is from Nordic, they also applied the usage of the ShockBurst(SB) hardware protocol accelerator. You can power this with 1.9V to 3.6V, with its I/O port logic at 3.3V or 5V. The transmitting rate is at +7dB, and receiving sensitivity of -90dB. It can transmit data with a range of up to 250m in an open area.
You could connect it to your Arduino with the SPI pins(MISO/MOSI) and power supply of 3.3V (VCC/GND).