The timer function does not work very well. There's no way to set the clock to turn on and off multiple times a day. In order for the light to turn on at a certain time, you need to wait for that time and turn it on. In the event of a power failure, the light will never turn on without manual adjustment. When someone goes on vacation, a power outage can ruin a planted aquarium. The external timer does not work as others have said. I like that it's waterproof and I don't have to worry about changing the water.
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