【Quality Guarantee】30 days money back, 7x24 hours email support. We are ensure customer satisfaction of our products. So if you have any question, please contact us.Packing List: 1 * Light Modulator 1 * English Manual 1 * Adhesive Tape 【Timing Light】This aquarium LED light dimmercombine the timer and the dimmer into one. With 8 sets of time brightness Settings, timer switch, simulate the different brightness switch of nature. 【Dimming LED Lamp】100 level dimming to meet the requirements of various plants and pets for light. The opening and closing adopts gradient mode to reduce impacts on fish. 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. 【LED Display】Industrial-grade LED display, reading can be seen from any angle clearly.