This was the perfect thing I needed. I needed a light timer and heating timer and this ticked all the boxes..This was priced well, seemed of very high quality and was very easy to set up once I read the directions a few times over.The functions are great and give you options for day and night temps, such as during the day my tank will stay between 83 to 87 degrees and then at night it drops to 72 to 76 degrees. That's what I set it to do and was very easy to make it happen. I like that it allows you to either keep one temp or have it swing temps, such as just keep it 80 degrees or let it fluctuate from let say 78 to 80. I feel that's more natural then just a constant setting, especially at night when you can have it drop even lower if needed to simulate night time temps.Also the light timer is great too, I just have it set for 9am to 8pm. But you can do more if you wanted too.Over all im very happy and glad I bought this, I would recommend to anyone who is looking for a simple heater and light combo timer.. my only issue is this company doeant seem to make a unit that has more outlets, so you could run 2 lights and 2 heaters for bigger tanks or other purposes. But I guess you could just buy two of these and call it a day..