Oase biOrb Aquarium Replacement Transformer can be used when your existing transformer has stopped working. Though the Transformers on the biOrbs are reliable and rarely need replacing, a time may come when a new one is needed. The Transformer has 2 sockets to plug your biOrb air pump and LED lights into. If you suspect your transformer is not working it is advised that you check the bulbs of the light units to see if they have stopped working. Suitable for all biOrb and BiUbe Aquariums that use AC Power. 12V AC power. Note - will only work with BiOrb tanks with AC equipment. Compact, can be easily hidden. Genuine BiOrb Part. Safety is vital when operating electrical items in close proximity to water. All aquariums need electrical power to operate their lighting.