Does it really turn on by itself at dusk?

Yes. A built-in photocell senses falling light and switches the two bulbs on, then off again at dawn. Keep the sensor window clear and out of direct glare from other lamps.

What bulbs does it take?

It uses two E12 candelabra-base bulbs, which are not included. LED candelabra bulbs are the usual pick for low running cost and less heat in a sealed fixture.

Is it safe in heavy rain?

The IP65 rating means it is protected against dust and water jets, so normal rain and splashing are fine. It is not rated for submersion, so mount it on a wall, not where water pools.

Can I use it with a wall switch or dimmer?

It wires to a standard wall circuit, but the dusk-to-dawn sensor controls the light. A dimmer is not supported, and a switched circuit may override the automatic operation.

How big is it and where should it go?

It is an 18-inch-tall wall lantern, sized for a porch, garage or entry wall. Check the mounting height so the sensor sees open sky rather than the underside of an eave.

Does it come with mounting hardware?

The fixture is sold as one unit with its wall-mount bracket and basic mounting screws. You supply the two E12 bulbs and any anchors your wall material needs.