Ultra Powerful with 1100 Lumens in Boost mode the DUO S is the most powerful rechargeable head torch in the Petzl line. It is multi beam and has five lighting modes making it adaptable to every situation: close range work, proximity, movement, rapid movement and long range vision. Featuring the Face2Face anti glare function, the DUO S headtorch allows those working in a group to face each other without blinding one another to work together more effectively.