Feature: 1. With 8 sets of time brightness Settings, timer switch, simulate the different brightness switch of nature. 2. Combine the timer and the dimmer into one. 3. 100 level dimming to meet the requirements of various plants and pets for light. 4. The opening and closing adopts gradient mode to reduce impacts on fish. 5. Industrial-grade LED display, reading can be seen from any angle clearly. Spec: Material: Plastic Color: Black Size (LengthWidthThickness): Approx. 741 cm/ 2.761.570.39 inch (Without Cable) Single Side Cable Length: Approx. 9.5 cm/ 3.74 inch Packing List: 1 * Light Modulator 1 * English Manual 1 * Adhesive Tape Operation Steps: Step 1: Open the package and take the dimmer out. Step 2: Connect the dimmer to the LED lamp. Step 3: Plug in the power to automatically turn on the dimmer. Step 4: Set the dimmer parameter.