NRF24L01+PA+PLA (+1Month Warranty) Wireless 2.4Ghz Transceiver Long Range, up to 600 Meters RF[ElectricA

Frequency Range: 2.4 GHz ISM Band
Maximum Air Data Rate: 2 Mb/s
Modulation Format: GFSK
Max. Output Power: 0 dBm
Operating Supply Voltage: 1.9 V to 3.6 V
Max. Operating Current: 13.5mA
Min. Current(Standby Mode): 26µA
Logic Inputs: 5V Tolerant
Communication Range: 800+ m (line of sight)

The nRF24L01+ transceiver module communicates over a 4-pin Serial Peripheral Interface (SPI) with a maximum data rate of 10Mbps. All the parameters such as frequency channel (125 selectable channels), output power (0 dBm, -6 dBm, -12 dBm or -18 dBm), and data rate (250kbps, 1Mbps, or 2Mbps) can be configured through SPI interface.

The SPI bus uses a concept of a Master and Slave, in most common applications our Arduino is the Master and the nRF24L01+ transceiver module is the Slave. Unlike the I2C bus the number of slaves on the SPI bus is limited, on the Arduino Uno you can use a maximum of two SPI slaves i.e. two nRF24L01+ transceiver modules.