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Having two or more Arduinos is able to communicate with each other wirelessly over a distance opens lots of possibilities:1. Remote sensors for temperature, pressure, alarms, much more2. Robot control and monitoring from 50 feet to 2000 feet distances3. Remote control and monitoring of nearby or neighborhood buildings4. Autonomous vehicles of all kindsThese are a series of 2.4 GHz Radio modules that are all based on the Nordic Semiconductor nRF24L01+ chip. The Nordic nRF24L01+ integrates a complete 2.4GHz RF transceiver, RF synthesizer, and baseband logic including the Enhanced Shock Burst™ hardware protocol accelerator supporting a high-speed SPI interface for the application controller.1. I/O can accept 5v level of input2. Low working voltage: 1.9 ~ 3.6 V3. Wireless rate: 1 or 2 MBPS4. SPI interface rate: 0 ~ 8MBPS5. It has transmission distance of 200 meters