This 240v 12v waterproof transformer is for use with 12v Garden Lights. Hardwire the 3 core rubber waterproof input cable to the mains. The 240v mains input then converts to 12v AC output via the transformer. Lumena transformers are available with a choice of 2 core rubber output cable. The output cable is detachable and connects to the transformer with a 2 pin plug, secured with a threaded cap. The output cable is then wired to the 12v fittings via a waterproof junction box.IMPORTANT INFORMATIONThe output of this transformer is A/C, therefore may not be suitable for some 12v LED systems. All Lumena 12v LED lamps and fittings will work with this transformer. The total wattage of a transformer should NEVER exceed the transformers wattage. We highly recommend not loading more than 90% of the transformers capacity, e.g. up to 18W on a 20W transformer. Lumena 12V transformers perform better over longer periods of time when loaded between 66% and 85% of their capacity.DO NOT TOTALLY SUBMERGE IN WATER. Although rated IP68, if the input mains voltage cable should become damaged, a rick of electrocution could resultUK Plug should be located indoors or connected to a waterproof socket.