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This timer functions nicely for dual-light fixtures on several of my reptile enclosures. Since this timer is not digital, there is a very faint whirring sound caused by the gears inside, but it's nothing that will keep you awake at night. I'll update this review if the product ever fails, but after a couple of months of use these are holding up great.
The only "problem" I have: There is no off setting in between day and night mode. As soon as the daytime bulb goes off, the night bulb immediately comes on. I would've liked a setting in between where neither light is on for a period of dawn/dusk hours when there is little sunlight/moonlight, but for the price I'm not complaining.