You can find this product under LED Panel Lights
Tips: How to reverse the BA9 adapters
Below is the conventional way to connect the BA9 adapter.
However, if this results the LED panel not lighting up, then you need to reverse the BA9 adapter. Simply use a small flat screw driver to move the pins of the LED panel side a little bit outwards.
After this, you can then insert the BA9 adapter again but this time reversed to resolve the LED not lighting up problem!