Abstract: A box with waterproof cable hole structure includes a lower case, a pressing block, an electricity cable, and a upper cover. The lower case includes an accommodating space defined therein and an opening connecting the accommodating space. A notch is formed on an edge of the opening, the notch has a lower pressing surface, and a lower cable groove is formed on the lower pressing surface. The pressing block is embedded into the notch. The pressing block further includes an upper pressing surface combined with the lower pressing surface, and the upper pressing surface includes an upper cable groove combined with the lower cable groove to form a cable hole. The electricity cable passes through the cable hole and is pressed between the upper pressing surface and the lower pressing surface. The upper cover is configured to be combined with the lower case to seal the opening.

Abstract: A power supply apparatus for string light includes a power cable, a switching circuit, and a power transformer. The switching circuit is electrically connected to the two wires and configured to selectively form a voltage grading between the two wires. The power transformer includes a power transforming circuit and a control circuit. The power transforming circuit receives an external power via an input terminal, transforms the external power into a driving power, and outputs the driving power via an output terminal. The receiving end of the power cable is electrically connected to the output terminal. The control circuit is electrically connected to the power transforming circuit and the two wires. The control circuit detects a voltage grading status between the two wires, and generates a switch signal according to the voltage grading status to the power transforming circuit to modulate the driving power.