The MYO RXP is the first Petzl headlamp that is regulated and programmable, allowing the user to choose the order of lighting levels and to precisely adapt light output. To do this, there are three lighting modes, for each of which the user can select the power from among ten possible levels, from 8 to 140 lumens. This feature allows the lamp to be programmed for the type of activity and the length of use. The maximum lighting mode works well for a short night run. A lower-level lighting mode would favor burn-time and would thus be appropriate for a multi-day trek. This headlamp has Boost mode (160 lumens) and a strobe mode that can be programmed (three strobe modes and one SOS mode). It is compatible with lithium batteries to optimize performance, even at low temperatures. The Wide Angle lens offers the option of switching instantly from a focused beam to a wide beam when necessary. Specifications: Weight: 175 g including batteries Operates on three alkaline AA/ LR6 alkaline batteries (included) Degree of protection: IP X4 (Water-resistant) Light quantity: 160 lumens (Boost) Maximum lighting distance: 77 meters Maximum light duration: 97 hours