In this video you can see how to program or reset the universal remote controller for remote relay, garage door etc.
It can be pain in the ass if you don't heave idea how to do this.
You can buy it on ebay for a few dollars and can select between 315 and 433 MHZ.

C80X 2CH Relay RF Remote Switch [Control DC motor] Fixed code
   • C80X 2CH Relay RF Remote Switch [Cont...  

Music:
Done Runnin RW Smith