Only compatible with Love Your Lights dimmable festoon lights. If you try and use this with another supplier's product it will not work. You must also have dimmable bulbs for this product to work with your festoon lights.
Simply detach your plug from your festoon belt. Place the connector in between the plug and the festoon belt. Align the male and female connectors to then screw in tight.
Watch the video on how to connect the Dimmer Unit.