We were able to install easily enough and they look really cool when riding around at night (we bought 2 for both wheels, pink) After a few weeks of night rides, the lights started getting dimmer until one went out completely. So now I’ve taken the one off, ready to replace the battery but there are no instructions ANYWHERE! The installation instructions only tell you how to install them on your bike and that it uses CR2032 size batteries and even warns of the dangers of swallowing them in case you have kids that might try to eat one. I’ve reviewed the button controls using a magnifying glass and found some suggestive arrows on the side which seem to hint at possibly twisting the top away from the bottom in the arrow’s direction but I’ve had no luck getting inside yet. I guess my choice is to now buy another one for $10 or look for another fun light alternative where the battery source and replacement aren’t such a mystery. If you buy this, just understand when the lights go out on this gizmo, you’ll have to buy another one if you want the fun to continue. Personally, at $20 bucks (for 2 wheels) for a couple weeks worth of use is comparable to buying a tank of gas. The choice is yours.
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