To protect the power supply against voltage surges we recommend that it's used in conjunction with a GFCI unit at the mains connection point.
When connecting the power supply to the trap for the first time, ensure that the weatherproof connectors are turned clockwise until tight as they are designed to be a tight fit to ensure that they are weatherproof.
We also suggest placing the power supply out of direct sunlight and in a sheltered position if possible. Also the power supply should not be placed directly on the ground but mounted 6 to 12 inches or so above the ground e.g. on top of a cinder block.