Originally Posted by AKTed

Thanks. It is a battery rear light, Busch & Muller 4DToplight Senso I got from SJS Cycles in the UK. It works fine (and I didn't want to run a wire all the way back from the dynamo) but it is sort of big and clunky. And it doesn't flash, it's just a solid light. Bush & Muller have a myriad of different models so I may look for something else that is a bit more elegant (although it is a LHT right?).