Steel-Line Australia have been in business for over 40 years. Steel Line manufacture a range of garage door and garage door openers. In 2016, Steel-Line Australia bought Boss Openers Australia and now sell Boss remote controls, rebranded as Steel Line.
If your remote control has one red and one blue button, you need the HT4 remote control.
Does your remote control have three buttons and light up red when the buttons are pressed? You need the HT3 remote control.
If you have a Steel Line branded garage door opener and your remote has four red buttons, you require the ZT-07.