The Boomer's single LED with integrated lens gives out plenty of red light and it has four modes. The two AAA batteries are held in a plastic case.
The whole unit is encased in Knog’s trademark single piece silicone shell (in many colours). It’s quick and easy to ﬁt vertically to a seatpost, but the long body means it needs a reasonable amount of space. An equivalent front light costs £24.99.