The Mammut Burny is described as a safety lamp. Weighing only 18g including the two CR2032 batteries. It has three modes; flood, red, and flashing red. And these are cycled through it that order by using the button on the front. At the rear there's a clip and an short loop of elastic. These allow the light to be mounted on cycle helmets, baseball caps, bike handle bars or shoulder straps of rucksack, etc. But unlike the Petzel e+Lite the clip doesn't have a mechanism allowing it to swivel so it can't be clipped to the brim of a cap and used like a head torch.
If you don't need to use the elastic to mount the light it can be removed saving a massive 2g! The elastic also has a very innovative tab that is used to open the battery hatch.
The lamp boast a brightness of 12 lumens and has a range of 12m in flood mode. And you'll be pleased to note that in flashing red mode it's visible from 500m and the battery will last up to 160 hours in that mode.
If you're fond of jogging after dark or need more lights adding to your bike's array then this little device is ideal.