With 350 lumens of power housed in a super compact, watertight body, the Cosmo 350 is perfect for urban adventures and overnighters in the woods. The Cosmo's new compact body is more ergonomic with a lower profile for improved balance, and the updated user interface includes a second switch for easy lens selection. The new Cosmo 350 is also Dual-Fuel compatible, allowing you to power the light with either the rechargeable BD 1500 Li-ion battery or three standard AAA batteries. In addition, the updated optical efficiency not only provides brighter light, but also saves battery life. And thanks to its watertight construction, the Cosmo keeps lighting the way whether you're forced to bike home in the rain, or you're hiking back to camp in an unexpected downpour.