Garage door remote control from Seav company 2 buttons, which allow you to program for 4 different channels. It operates at a frequency of 433.92MHz, the most common frequency on the market. This specific remote control uses fixed encoding, meaning it operates once with a code, which on one hand makes it more vulnerable to theft (i.e. someone else copying the code), but on the other hand, it is much easier for you to copy in case you want to replace it or create copies.