• NRF24L01 is a work in the 2.4-2.5GHz worldwide ISM band single-chip transceiver, wireless transceiver, including: the frequency generator; the enhanced Schock Burst TM mode controller; the power amplifier; the crystal amplifier modulator; the demodulator output; the power channel selection; and protocol set by the SPI interface to set a very low current consumption mode of 12.3 mA. Power-down mode and standby mode when in transmit mode emit a power of 6 dBm when the current consumption is 9.0 mA.
• Ball to open ISM band maximum 0 dBm transmit power, license-exempt use. The open 100 meters!
• Support six channels of data reception

(1) low operating voltage: 1.9 to 3.6V low-voltage
(2) high-rate: 2 Mbps; air transmission time is very short, greatly reducing the wireless transmission of collision phenomena (software settings: 1Mbps or 2Mbps air transmission rate)

• Multi-frequency points: 125 frequency points to meet the multi-point communications and frequency-hopping communications needs

4 ultra-compact: built-in 2.4GHz antenna compact 15x29mm (including antenna)
(5) Low power consumption: when in answer mode, communication, fast air transmission, and start-up time greatly reduce the current consumption.

• Low application cost: NRF24L01 integrates all RF protocol high-speed signal processing section, such as: automatically resending lost packets and automatically generating an acknowledge signal, etc. the nRF24L01 The SPI interface can take advantage of the microcontroller hardware SPI port or microcontroller I/O port to simulate the internal FIFO. It can be used with a variety of low-speed microprocessor interfaces, making it easy to use and low-cost.

7 facilitates the development: the link layer is fully integrated into the module, making it very easy to develop. Automatic retransmission function, automatic detection and retransmission of lost packets, the retransmission time and the number of retransmission can be software-controlled Automatic storage is not received when the packet of the response signal is auto-answer, After the receipt of valid data, the module automatically sends the reply fixed frequency detection signals without any additional programming Carrier Detect: The built-in hardware CRC error detection and point-to-multipoint communication address control packet transmission error counter and carrier detection can be used for frequency hopping. The set can also set up six to receive the channel address, and the pin Dip2.54MM spacing interfaces can be used for embedded applications.
Tutorial: https://lastminuteengineers.com/nrf24l01-arduino-wireless-communication/