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The lone green light towards the bottom of the tree is the float switch sensor in the water basin for the live tree. Literally just a 555 timer held in reset by the float switch. When this starts blinking green/blue, it means I need to pour more water in.
Absolutely fantastic not needing to remove the tree skirt and see what I'm doing; just move the skirt enough to blindly pour water in until the light stops blinking.
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