Title: No wonder it's cheap.
Product review: When we first opened the box, there were no instructions on it and the lights are much smaller (about 1.5 inches!) then the picture suggests. It came with batteries, which was a nice, but they will probably last you 10 hours. After finally figuring out how to pop out the case to put the batteries in, one of the lights did not work. The other one worked fine, but this worked occasionally. We figured the button was defective. It gives you a vague idea of how how to install it on your bike. I would not recommend anyone buying this. You get what you pay for.
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