$40 Homemade 'Arduino radio device' can Intercept Vehicle Key Fobs – More Than 100 Million Cars are Vulnerable « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Decoding and sending 433MHz RF codes with Arduino and rc-switch
Wireless RF Remote & Receiver! Easy & Cheap! Great for Arduino and Raspberry Pi! - YouTube
In-Depth: How nRF24L01 Wireless Module Works & Interface with Arduino
Change the color of the full-color LED with a radio button - Hackster.io
RF remote control using Arduino and 433mhz ASK module