One compact USB rechargeable light that acts as either a front or a rear a | it&';s a 2&';Fer! The Blackburn GRID 2&';Fer light features both a 60 lumen front light and a 20 lumen rear light. Use them and mix and match as you&';d like and the Grid 2&';Fer lets you be seen how you want it. Blackburn&';s Grid light mounts wherever you want it. While the it comes with a wraparound tool-free mount to your rack, basket, handlebar, or seatpost, it also comes with a clip to put on clothing or your pack. The Blackburn Grid 2&';Fer lights are rechargeable through an included Micro-USB cord. While we do not consider this light to be strong enough to be a primary front or rear light for a bike rider, it is a great emergency option or complement to help you be seen in traffic and on the road.