These are a series of 2.4 GHz Radio modules that are all based on the Nordic Semiconductor  module nRF24L01. The Nordic nRF 24L01 integrates a complete 2.4GHz RF transceiver, RF synthesizer, and  Enhanced ShockBurst™ hardware protocol accelerator supporting a high-speed SPI interface for the application controller. 

The low-power module with range about (60 meter or so)Transceiver is available on a board with Arduino interface and built-in Antenna. Having two or more Arduinos be able to communicate with each other wirelessly over a distance opens lots of possibilities:

• Remote sensors for temperature, pressure, alarms, much more
• Robot control and monitoring up to 85 meters
• Remote control and monitoring of nearby or neighborhood buildings

Transceivers like these both send and receive data in 'packets' of several bytes at a time. There is built-in error correction and resending, and it is possible to have one unit communicate with up to 6 other similar units at the same time.

Note: We have tested this module in Future Electronics (Arduino Egypt) site with one tranceiver indoors and the other one outdoors and the communication distance was more than 85 meters

Features

• Power Supply: 3.3 v
• On-board integrated pcb antenna
• 100m Range at 250kbps
• Ultra low power consumption – months to years of battery lifetime
• 250kbps to 2Mbit Data Rate
• Auto Acknowledge & Auto Re-Transmit
• Multiceiver - 6 Data Pipes
• Software selectable channel from 2400MHz to 2525MHz (125 Selectable channels)

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​​For nRF24L01 datasheet, click here

Everything You Need to Know about the nRF24L01

​For nRF24L01-2.4GHz - HowTo and Arduino examples, click here