The Nitecore MT1A features a premium CREE XP-G R5 LED, capable of producing a maximum output of up to 140 Lumens. It has a high efficiency circuit board which enables it to run up to 60 hours. This light also has 2 rapid swithcing modes including a user-defined mode which allows you to customize brightness levels. As with many Nitecore flashlights, it comes with reverse polarity protection. For optimal visibility, the lens is made from toughened ultra-clear mineral glass with an AR coating.