For S2, the brightness change of exit and sunset varies in a jump shape; S2 PRO is gradual, softer than S2. S2 PRO has a night light mode. S2 PRO increases the frequency and reduces the noise.Digital tube with display Industrial grade LED that can be easily detected in any angle and light. 100 level dimming to meet the light requirements of multiple plants and animals. At the same time, the open and closed mode use the grade mode to reduce the effect on the fish With 8 sets of time brightness settings, timer switch, simulate nature’s different brightness switches. Combines timer and dimmer in one. 0.05 UM patch, dawn and dusk mature procedures, all factory tested. Installation: Before installation, please confirm the power source and lamp power, which is less than 100W. Please check the lamp interface (5.5mm DC lock) and connect the modulator in series between the lamp and power source: Step 1: Open the package and remove the dimmer. Step 2: Connect the dimmer to the LED lamp. 3: Plug