If you only have a single center adjust knob you will want to fully expand the gate. In the center area you will find the Safety 1st address and below that the product number. If you have two adjusting knobs you will need to look below the handle for the same information. This information can be found raised in the plastic on the unfinished side of the gate. If your gate adjusts by pulling the handle up to the second position, then your model information will be on a warning sticker on one end of the gate, it normally says "No." All letters that follow the numbers are part of the model information.