This is the genuine and original one-button BOSS remote control with mark of MODEL 2211-L (TX) on the back cover.
The button is black coloured surrounded by red circle. There is another BOSS one-button remote BHT1 with the same shape and model number 2211-L (TX) where the only difference is the white button surrounded by red circle.
The white button one is mainly used for control of the entry gate or door of a block of units as the residents can easily program the new remote by matching the dip switches inside the remote with those inside the opener/motor without requiring access to the receiver of the opener/motor. The black button one doesn't have dip switches inside therefore programming requires access to the opener to press the Learn/Code Set button on the receiver board.
So, the conclusion is simple, just buy the one with the same colour of your current one! We have both of them in stock!
This one is upgraded to Guardian 3B.