The Planted Tank Forum - View Single Post - timers for lights
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Old 12-11-2012, 01:22 PM   #31
mach_six
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The digital timer I got at Target has an internal battery. Not sure how long the battery lasts for but it's only 1 2 prong out but can hold up to 5 preset. If you don't mind the bulk, you can buy the ones they sell for outdoor holiday lighting when they clearance them.

I mainly use the mechanical since the lights are always one every day same time.
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