At first, please choose the manufacturer of your remote control. Usually you will find manufacturer and exact type of your remote control printed on the housing or inside the battery compartment. Be careful with determining your type just by looking at the photos since same housings might be used for different frequencies ans types. Frequent online help menus will guide you to find thr right remote control.
Start with choosing the manufacturer at the left side. Due to the huge number of remote controls please use the filter functions, e.g. by picking out number of buttons or production series.
Alternatively you can use the quick search function at the top of the left page. Simply type all known data, e.g. SKX, SF433, S453B. All remote controls which show same or simliar data will be listed. However, even a known frequency may help you to find your type.