1.Combine the timer and the dimmer into one.2.With 8 sets of time brightness Settings, timer switch, the different brightness switch of nature.3. sunrise and sunset to provide a natural day and night cycle for your fish.4.Automatically turns your aquarium lamps on and off as you set.5.Can also be used as a dimmer, the brightness can be adjusted from 0-100 percent .Cautions:1.Use only the power supply from accessory with AC 100-240V input DC 5V-30V.2.This device is NOT waterproof.Wide range voltage input: DC5V-30VSunrise and Sunset models: 90 Minutes 12 or 24 Hours OptionsMaximum power 150WMaterial:plasticcolour:blackPackage Contents:1 x Light Dimmer ControllerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.