【Adjustable Lighting Angle】: The supporting rod of the aquarium lighting can rotate 360 °, making it easy to adjust the direction of light. Just gently rotate the support hose to easily find the optimal angle for the light to illuminate. 【Adjustable Brightness】: This fish tank light has an external controller, which can be pressed to select the light mode and adjust the brightness. Provide 3 lighting modes: warm white, neutral white, and cool white and ten different brightness levels, to create diverse landscapes and beautify fish tanks. 【Adjustable Focal Length】: By adjusting the forward and backward movement of the light head, the illumination range can be changed to achieve beam focusing. Push forward, the light beam shrinks; push backward to amplify the light beam. 【Clip On Installation】: This aquarium lamp is fixed and installed with a clamp, suitable for glass thickness between 0.3cm-1cm (0.11"-0.39"). Mini and compact, perfect for decorating 20cm-40cm size small fish tanks with aquatic plants, turtles, corals, and other landscaping elements. 【Widely Applicable】: The working voltage is DC 5V, suitable for USB interface adapters (power plug not included in the package). Can connect devices with USB ports such as mobile phone charging plugs, power banks, computers, laptops, etc.