Bought 16 of these. They all work. I bought these to use in 2 rows of 4 (8 total) crape myrtle trees. I was hoping 2 in each tree would be fine. However, it's not as dramatic as I imagined. The lights themselves are great. I just think I need LOTS of them to look the way I want. I also think that I need several tubes of different lengths. I noticed that the product title states that the chain contains 10 tubes. However, this may only apply to the multicolor option. Warm white only has 8. The lights are bright enough and it's great not having to run wires or worry about overloading the circuit. Most of the length of the string runs from the solar panel to the first tube. This section has a 2 pin connector that mates with the 2 holes of the other section. If you disconnect, make sure to reconnect the same way. If your lights aren't working, try unplugging and rotating the plugs (change which pin goes in which hole) and plugging them back in. Hope they last a few years. And I'd happily spend two thousand dollars on lights. Because I really think I need 8-10 strands in each tree.
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