This 10 meter long extension cable from Garden Lights accessory range can be used as a longer lead cable from the transformer to the main cable or as an extension cable from the main cable to the lights.
It has an IP44 rating, which means it can be used outdoors.
Note - When connecting the garden lights, in addition to this extension cable, you may also need other accessories such as a transformer, a main cable, a cable splitter or a connector.