Exclusive in-frame mounting allows you to see the light without seeing the fixture, and integrated cord routing helps to complete the illusion. The directional adjustment dial gives you the ability to shine the light where you want it. These lights are fully submersible, and come with suction cups to give you endless possibilities on how to use these systems. Control over the light while keeping the consumers hand dry. Also allows for a night light feature. Allows the consumer to direct the light where they need it. Bulbs never need replacement.Adjustable to fit your aquarium.