The 12-volt plug-in transformer includes a 6' (72" or 182.9 cm) power cord and an 8' (96" or 243.9 cm) extension cable.
Additionally, you can order up to ONE additional extension cable, available in 4' (48" or 121.9 cm) and 8' (96" or 243.8 cm) lengths. Never attach more than two extension cables to a plug-in transformer.
When you order your plug-in transformer and extension cable(s), consider the location of your wall's power outlet. The outlet must be within the length of the power cord plus extension cable(s). Cords cannot be cut or trimmed to length. Consider aesthetics, too. You'll need to decide how best to hide the cord.