The nRF24 Series includes both the nRF24L and nRF24AP2 ICs.
Each nRF24L IC uses Nordic Semiconductor's Enhanced ShockBurst protocol which enables the implementation of ultra-low power and high performance communication with low cost host microcontrollers.
The nRF24AP2 ICs are low-cost, high-performance 2.4 GHz ISM single-chip connectivity devices with an embedded ANTâ„¢ protocol stack.