2 Packs, Seed Starter Trays With High Dome Germination Kit - 80 Cells, 4 LED Grow Lights, Smart Timer 3 Modes For Home Garden How does the smart timer work? 1?Red light means 3 h on, 21 h off; 2?Blue light means 6 h on, 18 h off; 3?both red and blue light on means 12 h on, 12 h off. Regardless of which mode is set, as long as the power is not disconnected, it will automatically light up every day thereafter. Shipping Fast Shipping Worldwide Payments All payments are accepted via PayPal. Feedbacks The product came very well packaged. I'm very happy. thank you for everything. Seller strongly recommended. This is great! I recommend! The product looks amazing. Delivery was fast. Excellent seller, great communication. I advise everyone.