Very interesting Kingmustard.
I have no idea what the 2x buttons do or the 'sound' button.
One of the 2x button symbols looks like opening the tailgate remotely, but why 2x ?
I could only hazard a guess about the sound button, as I had that on a keyfob on an aftermarket alarm system on a previous car, and when pressed its sounds the car horn for a minute, so you can find your car a busy carpark, if you have forgotten where you left it.... DOH