Yes, it installs as a hardwired fixture, and professional installation is recommended.
It uses a 120V hardwired power source.
Yes, it is rated for use in damp environments.
Wipe the shade and finish with a soft, dry cloth or a static duster.
Avoid harsh chemicals and abrasive cleaners, as they may damage the finish.
On silver-toned finishes, a milky-white tarnish can develop over time, especially in humid environments, and it can be removed with a clean, soft cloth.