Nao headlamps have been popular since the first model. Their advantages include the possibility to choose between constant light output and Petzl Reactive Lighting mode: you can choose the used outputs completely yourself or let the light adjust the output within the limits you choose. Battery run time chart can be found in the extra image. Map reading and other close-up work become much easier when the light adjusts its power according to the situation. This also significantly saves the battery - different environments reflect light in different ways and there is no need to push at full power all the time. Nao RL 1500 is rechargeable and very light. The battery and the lighting part stay firmly on your head even when going hard. Petzl is a manufacturer we find very easy to recommend: their background in caving and climbing equipment has ensured an intensely quality-oriented product lineup. - Switchable reactivity: use as a regular or reactive lamp - There is a red rear light conn