With the small mobile taillights that is such a thing. At some point you're too lazy, always remove it and to drag himself around and Zack! - Is gone it! That happened to me several times until I found the taillight of Busch & Müller, whose grandiose spotlight has already convinced me. A great part! It illuminates extremely bright, the battery power is top (after almost a year previously needed no change, and I drive a day), the automatic function I do not use, makes only on long trips sense if you do not want to get off, when it gets dark (well , too ...). And most importantly: It can be at the wheel, without having to worry that it will be stolen! But wait! Not quite right! First, I have it namely so used exactly as seen in the picture, with quick release! So it took only a week, had disappeared to saddle support and light, in broad daylight in a public place! Without light, no one had been interested in the (very good) saddle ...