This LED wall sconces dimmable?
No, the porch wall light only 2700-3000K warm white light.
Does this wall sconce have an automatic on/off function?
No.
Is this wall sconce suitable for indoor lighting?
Black wall sconce is more suitable for outdoor wall lighting, indoor lighting is also suitable.
Do I need to install it myself or a professional?
Professional installation is required. This led patio wall light is installed by hardwiring, remember to cut off the power before installation.