On SON website when you go on the main page it will show you rear lights in two sections, SON rear Light and SON rear light DC. DC ones are for electric bikes, so you need to check the first ones which would run off of dynamo. There are many suppliers offering SON’s products, www.bike24.com and www.starbike.com to name a few. If you are not sure about any particular model you can contact SON support over their website, they are pretty quick to answer.