It works and is very solid. Sie fallen wie von Kamik gewohnt kleiner aus. The strap for clipping is super awkward. The device uses a DSP (Digital Sound Processor) to constantly tune the sound for optimum output and its performed very well. I like this towel rake a lot hang it next to my bathtub. and was told that it is likely due to a manufacturing defect. The armband is fine for my size arm, however for someone younger like in their teens or below, it may not fit so well, so just be cautious of that. I was looking for a rear bike light that incorporated some motion-sensing / braking technology. the only complaint is i did NOT get the shoe i ordered, it falsely advertised a shoe and i ordered multiple pair and did not get the shoe pictured Ive been wearing Birkenstock sandals for a quite a few years, and these were ordered to replace an older pair.