The GR8000 is a 4 channel universal cloning remote that can copy all 433Mhz fixed code remote with DIP switches or fixed code remotes. With a tough casing and sliding front cover to prevent accidental button pressing.
These GR8000 universal cloning remotes can only copy 433 MHz DIP switch remote controls. To check you remote open up the case to see if it has DIP switches as shown below.
Your remote Should have between 8 and 12 switches inside that look similar to those shown above. The GR4000 can assign up to 4 different channels to the 4 buttons. I.e. up to 4 garage door or gate receivers.