Garage door remote control from Silca company 4 buttons, which allow you to program for 4 different channels. With this remote control, you can copy the remote control if you want to replace it (e.g. due to damage), or if you want to create more copies (e.g. for other family members). This specific remote control uses rolling encoding, meaning every time you use it, a different/new code is generated. This provides greater security, as there is no fixed code and therefore cannot be stolen.