1.Combine the timer and the dimmer into one. 2.With 8 sets of time brightness Settings, timer switch, simulate the different brightness switch of nature. 3.Simulate sunrise & 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%. 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-30V Sunrise and Sunset models: 90 Minutes 12/24 Hours Options Maximum power 150W Material:plastic colour:black Package Contents: 1 x Light Dimmer Controller Only the above package content, other products are not included. Note: Light reflection 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.