[Reza’s] methodical investigation of this remote controlled outlet let him patch in with an Arduino using a 433 MHz transmitter ... straight for a wireless receiver he had on hand, using ...

The transmitter and receiver For the transmitter, he turned an Arduino Pro Micro into a USB sound card which he could plug into his laptop. That outputs both the audio signal and a 40 kHz carrier ...

The ShortLink Sub-GHz Transceiver RF IP ... RF IP for the 433MHz frequency band. It offers a data rate of 128 kbps (Rx/Tx), 3-4Mbps (Tx) . The IP has support for FSK modulation and demodulation.