PETZL - NAO+ Headlamp, 750 Lumens, Bluetooth Enabled LONGER BURN TIME: Enhanced visual quality, and reduced to a minimum manual intervention, thanks to the REACTIVE LIGHTING technology. The luminosity and shape of the beam to be adjusted automatically via a brightness sensor to optimize battery life. CONSTANT LIGHTING: It is also possible to use the lamp with the CONSTANT LIGHTING technology, which guarantees a constant luminosity during the entire lighting period. MULTIPLE LIGHT CONES: Combination of a wide light cone for close-up vision and a focused light cone for long-distance vision. RECHARGEABLE BATTERY: Lithium-ion battery 3100 mAh with charging via USB port, and charge indicator and a blue LED when activated the Bluetooth Smart. USES PETZL MY LIGHT APP: Shape of the light cone, light duration and luminosity can use the mobile application MyPetzl Light for Smartphone and Tablet (a free download from the App Store and Google Play).